Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8006479c9b75fb6594a7b746af3d7f1fbb68f18f
Commit:     8006479c9b75fb6594a7b746af3d7f1fbb68f18f
Parent:     501cc54c4d2b0c2bbae1a6490b0e547be46fc09f
Author:     Dmitry Torokhov <[EMAIL PROTECTED]>
AuthorDate: Thu Aug 30 00:22:11 2007 -0400
Committer:  Dmitry Torokhov <[EMAIL PROTECTED]>
CommitDate: Thu Aug 30 00:22:11 2007 -0400

    Input: implement proper locking in input core
    
    Also add some kerneldoc documentation to input.h
    
    Signed-off-by: Dmitry Torokhov <[EMAIL PROTECTED]>
---
 drivers/input/input.c |  666 ++++++++++++++++++++++++++++++++++++-------------
 include/linux/input.h |  112 ++++++++-
 2 files changed, 595 insertions(+), 183 deletions(-)

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 5fe7555..c59544f 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -17,10 +17,10 @@
 #include <linux/major.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
-#include <linux/interrupt.h>
 #include <linux/poll.h>
 #include <linux/device.h>
 #include <linux/mutex.h>
+#include <linux/rcupdate.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <[EMAIL PROTECTED]>");
 MODULE_DESCRIPTION("Input core");
@@ -31,167 +31,244 @@ MODULE_LICENSE("GPL");
 static LIST_HEAD(input_dev_list);
 static LIST_HEAD(input_handler_list);
 
+/*
+ * input_mutex protects access to both input_dev_list and input_handler_list.
+ * This also causes input_[un]register_device and input_[un]register_handler
+ * be mutually exclusive which simplifies locking in drivers implementing
+ * input handlers.
+ */
+static DEFINE_MUTEX(input_mutex);
+
 static struct input_handler *input_table[8];
 
-/**
- * input_event() - report new input event
- * @dev: device that generated the event
- * @type: type of the event
- * @code: event code
- * @value: value of the event
- *
- * This function should be used by drivers implementing various input devices
- * See also input_inject_event()
- */
-void input_event(struct input_dev *dev, unsigned int type, unsigned int code, 
int value)
+static inline int is_event_supported(unsigned int code,
+                                    unsigned long *bm, unsigned int max)
 {
-       struct input_handle *handle;
+       return code <= max && test_bit(code, bm);
+}
 
-       if (type > EV_MAX || !test_bit(type, dev->evbit))
-               return;
+static int input_defuzz_abs_event(int value, int old_val, int fuzz)
+{
+       if (fuzz) {
+               if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
+                       return old_val;
 
-       add_input_randomness(type, code, value);
+               if (value > old_val - fuzz && value < old_val + fuzz)
+                       return (old_val * 3 + value) / 4;
 
-       switch (type) {
+               if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
+                       return (old_val + value) / 2;
+       }
 
-               case EV_SYN:
-                       switch (code) {
-                               case SYN_CONFIG:
-                                       if (dev->event)
-                                               dev->event(dev, type, code, 
value);
-                                       break;
-
-                               case SYN_REPORT:
-                                       if (dev->sync)
-                                               return;
-                                       dev->sync = 1;
-                                       break;
-                       }
-                       break;
+       return value;
+}
 
-               case EV_KEY:
+/*
+ * Pass event through all open handles. This function is called with
+ * dev->event_lock held and interrupts disabled. Because of that we
+ * do not need to use rcu_read_lock() here although we are using RCU
+ * to access handle list. Note that because of that write-side uses
+ * synchronize_sched() instead of synchronize_ru().
+ */
+static void input_pass_event(struct input_dev *dev,
+                            unsigned int type, unsigned int code, int value)
+{
+       struct input_handle *handle = rcu_dereference(dev->grab);
 
-                       if (code > KEY_MAX || !test_bit(code, dev->keybit) || 
!!test_bit(code, dev->key) == value)
-                               return;
+       if (handle)
+               handle->handler->event(handle, type, code, value);
+       else
+               list_for_each_entry_rcu(handle, &dev->h_list, d_node)
+                       if (handle->open)
+                               handle->handler->event(handle,
+                                                       type, code, value);
+}
 
-                       if (value == 2)
-                               break;
+/*
+ * Generate software autorepeat event. Note that we take
+ * dev->event_lock here to avoid racing with input_event
+ * which may cause keys get "stuck".
+ */
+static void input_repeat_key(unsigned long data)
+{
+       struct input_dev *dev = (void *) data;
+       unsigned long flags;
 
-                       change_bit(code, dev->key);
+       spin_lock_irqsave(&dev->event_lock, flags);
 
-                       if (test_bit(EV_REP, dev->evbit) && 
dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
-                               dev->repeat_key = code;
-                               mod_timer(&dev->timer, jiffies + 
msecs_to_jiffies(dev->rep[REP_DELAY]));
-                       }
+       if (test_bit(dev->repeat_key, dev->key) &&
+           is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
 
-                       break;
+               input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
 
-               case EV_SW:
+               if (dev->sync) {
+                       /*
+                        * Only send SYN_REPORT if we are not in a middle
+                        * of driver parsing a new hardware packet.
+                        * Otherwise assume that the driver will send
+                        * SYN_REPORT once it's done.
+                        */
+                       input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+               }
 
-                       if (code > SW_MAX || !test_bit(code, dev->swbit) || 
!!test_bit(code, dev->sw) == value)
-                               return;
+               if (dev->rep[REP_PERIOD])
+                       mod_timer(&dev->timer, jiffies +
+                                       msecs_to_jiffies(dev->rep[REP_PERIOD]));
+       }
 
-                       change_bit(code, dev->sw);
+       spin_unlock_irqrestore(&dev->event_lock, flags);
+}
 
-                       break;
+static void input_start_autorepeat(struct input_dev *dev, int code)
+{
+       if (test_bit(EV_REP, dev->evbit) &&
+           dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
+           dev->timer.data) {
+               dev->repeat_key = code;
+               mod_timer(&dev->timer,
+                         jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
+       }
+}
 
-               case EV_ABS:
+#define INPUT_IGNORE_EVENT     0
+#define INPUT_PASS_TO_HANDLERS 1
+#define INPUT_PASS_TO_DEVICE   2
+#define INPUT_PASS_TO_ALL      (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
 
-                       if (code > ABS_MAX || !test_bit(code, dev->absbit))
-                               return;
+static void input_handle_event(struct input_dev *dev,
+                              unsigned int type, unsigned int code, int value)
+{
+       int disposition = INPUT_IGNORE_EVENT;
 
-                       if (dev->absfuzz[code]) {
-                               if ((value > dev->abs[code] - 
(dev->absfuzz[code] >> 1)) &&
-                                   (value < dev->abs[code] + 
(dev->absfuzz[code] >> 1)))
-                                       return;
+       switch (type) {
 
-                               if ((value > dev->abs[code] - 
dev->absfuzz[code]) &&
-                                   (value < dev->abs[code] + 
dev->absfuzz[code]))
-                                       value = (dev->abs[code] * 3 + value) >> 
2;
+       case EV_SYN:
+               switch (code) {
+               case SYN_CONFIG:
+                       disposition = INPUT_PASS_TO_ALL;
+                       break;
 
-                               if ((value > dev->abs[code] - 
(dev->absfuzz[code] << 1)) &&
-                                   (value < dev->abs[code] + 
(dev->absfuzz[code] << 1)))
-                                       value = (dev->abs[code] + value) >> 1;
+               case SYN_REPORT:
+                       if (!dev->sync) {
+                               dev->sync = 1;
+                               disposition = INPUT_PASS_TO_HANDLERS;
                        }
-
-                       if (dev->abs[code] == value)
-                               return;
-
-                       dev->abs[code] = value;
                        break;
+               }
+               break;
 
-               case EV_REL:
+       case EV_KEY:
+               if (is_event_supported(code, dev->keybit, KEY_MAX) &&
+                   !!test_bit(code, dev->key) != value) {
 
-                       if (code > REL_MAX || !test_bit(code, dev->relbit) || 
(value == 0))
-                               return;
+                       if (value != 2) {
+                               __change_bit(code, dev->key);
+                               if (value)
+                                       input_start_autorepeat(dev, code);
+                       }
 
-                       break;
+                       disposition = INPUT_PASS_TO_HANDLERS;
+               }
+               break;
 
-               case EV_MSC:
+       case EV_SW:
+               if (is_event_supported(code, dev->swbit, SW_MAX) &&
+                   !!test_bit(code, dev->sw) != value) {
 
-                       if (code > MSC_MAX || !test_bit(code, dev->mscbit))
-                               return;
+                       __change_bit(code, dev->sw);
+                       disposition = INPUT_PASS_TO_HANDLERS;
+               }
+               break;
 
-                       if (dev->event)
-                               dev->event(dev, type, code, value);
+       case EV_ABS:
+               if (is_event_supported(code, dev->absbit, ABS_MAX)) {
 
-                       break;
+                       value = input_defuzz_abs_event(value,
+                                       dev->abs[code], dev->absfuzz[code]);
 
-               case EV_LED:
+                       if (dev->abs[code] != value) {
+                               dev->abs[code] = value;
+                               disposition = INPUT_PASS_TO_HANDLERS;
+                       }
+               }
+               break;
 
-                       if (code > LED_MAX || !test_bit(code, dev->ledbit) || 
!!test_bit(code, dev->led) == value)
-                               return;
+       case EV_REL:
+               if (is_event_supported(code, dev->relbit, REL_MAX) && value)
+                       disposition = INPUT_PASS_TO_HANDLERS;
 
-                       change_bit(code, dev->led);
+               break;
 
-                       if (dev->event)
-                               dev->event(dev, type, code, value);
+       case EV_MSC:
+               if (is_event_supported(code, dev->mscbit, MSC_MAX))
+                       disposition = INPUT_PASS_TO_ALL;
 
-                       break;
+               break;
+
+       case EV_LED:
+               if (is_event_supported(code, dev->ledbit, LED_MAX) &&
+                   !!test_bit(code, dev->led) != value) {
 
-               case EV_SND:
+                       __change_bit(code, dev->led);
+                       disposition = INPUT_PASS_TO_ALL;
+               }
+               break;
 
-                       if (code > SND_MAX || !test_bit(code, dev->sndbit))
-                               return;
+       case EV_SND:
+               if (is_event_supported(code, dev->sndbit, SND_MAX)) {
 
                        if (!!test_bit(code, dev->snd) != !!value)
-                               change_bit(code, dev->snd);
+                               __change_bit(code, dev->snd);
+                       disposition = INPUT_PASS_TO_ALL;
+               }
+               break;
 
-                       if (dev->event)
-                               dev->event(dev, type, code, value);
+       case EV_REP:
+               if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
+                       dev->rep[code] = value;
+                       disposition = INPUT_PASS_TO_ALL;
+               }
+               break;
 
-                       break;
+       case EV_FF:
+               if (value >= 0)
+                       disposition = INPUT_PASS_TO_ALL;
+               break;
+       }
 
-               case EV_REP:
+       if (type != EV_SYN)
+               dev->sync = 0;
 
-                       if (code > REP_MAX || value < 0 || dev->rep[code] == 
value)
-                               return;
+       if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
+               dev->event(dev, type, code, value);
 
-                       dev->rep[code] = value;
-                       if (dev->event)
-                               dev->event(dev, type, code, value);
+       if (disposition & INPUT_PASS_TO_HANDLERS)
+               input_pass_event(dev, type, code, value);
+}
 
-                       break;
+/**
+ * input_event() - report new input event
+ * @dev: device that generated the event
+ * @type: type of the event
+ * @code: event code
+ * @value: value of the event
+ *
+ * This function should be used by drivers implementing various input
+ * devices. See also input_inject_event().
+ */
 
-               case EV_FF:
+void input_event(struct input_dev *dev,
+                unsigned int type, unsigned int code, int value)
+{
+       unsigned long flags;
 
-                       if (value < 0)
-                               return;
+       if (is_event_supported(type, dev->evbit, EV_MAX)) {
 
-                       if (dev->event)
-                               dev->event(dev, type, code, value);
-                       break;
+               spin_lock_irqsave(&dev->event_lock, flags);
+               add_input_randomness(type, code, value);
+               input_handle_event(dev, type, code, value);
+               spin_unlock_irqrestore(&dev->event_lock, flags);
        }
-
-       if (type != EV_SYN)
-               dev->sync = 0;
-
-       if (dev->grab)
-               dev->grab->handler->event(dev->grab, type, code, value);
-       else
-               list_for_each_entry(handle, &dev->h_list, d_node)
-                       if (handle->open)
-                               handle->handler->event(handle, type, code, 
value);
 }
 EXPORT_SYMBOL(input_event);
 
@@ -202,102 +279,230 @@ EXPORT_SYMBOL(input_event);
  * @code: event code
  * @value: value of the event
  *
- * Similar to input_event() but will ignore event if device is "grabbed" and 
handle
- * injecting event is not the one that owns the device.
+ * Similar to input_event() but will ignore event if device is
+ * "grabbed" and handle injecting event is not the one that owns
+ * the device.
  */
-void input_inject_event(struct input_handle *handle, unsigned int type, 
unsigned int code, int value)
+void input_inject_event(struct input_handle *handle,
+                       unsigned int type, unsigned int code, int value)
 {
-       if (!handle->dev->grab || handle->dev->grab == handle)
-               input_event(handle->dev, type, code, value);
-}
-EXPORT_SYMBOL(input_inject_event);
-
-static void input_repeat_key(unsigned long data)
-{
-       struct input_dev *dev = (void *) data;
+       struct input_dev *dev = handle->dev;
+       struct input_handle *grab;
+       unsigned long flags;
 
-       if (!test_bit(dev->repeat_key, dev->key))
-               return;
+       if (is_event_supported(type, dev->evbit, EV_MAX)) {
+               spin_lock_irqsave(&dev->event_lock, flags);
 
-       input_event(dev, EV_KEY, dev->repeat_key, 2);
-       input_sync(dev);
+               grab = rcu_dereference(dev->grab);
+               if (!grab || grab == handle)
+                       input_handle_event(dev, type, code, value);
 
-       if (dev->rep[REP_PERIOD])
-               mod_timer(&dev->timer, jiffies + 
msecs_to_jiffies(dev->rep[REP_PERIOD]));
+               spin_unlock_irqrestore(&dev->event_lock, flags);
+       }
 }
+EXPORT_SYMBOL(input_inject_event);
 
+/**
+ * input_grab_device - grabs device for exclusive use
+ * @handle: input handle that wants to own the device
+ *
+ * When a device is grabbed by an input handle all events generated by
+ * the device are delivered only to this handle. Also events injected
+ * by other input handles are ignored while device is grabbed.
+ */
 int input_grab_device(struct input_handle *handle)
 {
-       if (handle->dev->grab)
-               return -EBUSY;
+       struct input_dev *dev = handle->dev;
+       int retval;
 
-       handle->dev->grab = handle;
-       return 0;
+       retval = mutex_lock_interruptible(&dev->mutex);
+       if (retval)
+               return retval;
+
+       if (dev->grab) {
+               retval = -EBUSY;
+               goto out;
+       }
+
+       rcu_assign_pointer(dev->grab, handle);
+       /*
+        * Not using synchronize_rcu() because read-side is protected
+        * by a spinlock with interrupts off instead of rcu_read_lock().
+        */
+       synchronize_sched();
+
+ out:
+       mutex_unlock(&dev->mutex);
+       return retval;
 }
 EXPORT_SYMBOL(input_grab_device);
 
-void input_release_device(struct input_handle *handle)
+static void __input_release_device(struct input_handle *handle)
 {
        struct input_dev *dev = handle->dev;
 
        if (dev->grab == handle) {
-               dev->grab = NULL;
+               rcu_assign_pointer(dev->grab, NULL);
+               /* Make sure input_pass_event() notices that grab is gone */
+               synchronize_sched();
 
                list_for_each_entry(handle, &dev->h_list, d_node)
-                       if (handle->handler->start)
+                       if (handle->open && handle->handler->start)
                                handle->handler->start(handle);
        }
 }
+
+/**
+ * input_release_device - release previously grabbed device
+ * @handle: input handle that owns the device
+ *
+ * Releases previously grabbed device so that other input handles can
+ * start receiving input events. Upon release all handlers attached
+ * to the device have their start() method called so they have a change
+ * to synchronize device state with the rest of the system.
+ */
+void input_release_device(struct input_handle *handle)
+{
+       struct input_dev *dev = handle->dev;
+
+       mutex_lock(&dev->mutex);
+       __input_release_device(handle);
+       mutex_unlock(&dev->mutex);
+}
 EXPORT_SYMBOL(input_release_device);
 
+/**
+ * input_open_device - open input device
+ * @handle: handle through which device is being accessed
+ *
+ * This function should be called by input handlers when they
+ * want to start receive events from given input device.
+ */
 int input_open_device(struct input_handle *handle)
 {
        struct input_dev *dev = handle->dev;
-       int err;
+       int retval;
 
-       err = mutex_lock_interruptible(&dev->mutex);
-       if (err)
-               return err;
+       retval = mutex_lock_interruptible(&dev->mutex);
+       if (retval)
+               return retval;
+
+       if (dev->going_away) {
+               retval = -ENODEV;
+               goto out;
+       }
 
        handle->open++;
 
        if (!dev->users++ && dev->open)
-               err = dev->open(dev);
-
-       if (err)
-               handle->open--;
+               retval = dev->open(dev);
+
+       if (retval) {
+               dev->users--;
+               if (!--handle->open) {
+                       /*
+                        * Make sure we are not delivering any more events
+                        * through this handle
+                        */
+                       synchronize_sched();
+               }
+       }
 
+ out:
        mutex_unlock(&dev->mutex);
-
-       return err;
+       return retval;
 }
 EXPORT_SYMBOL(input_open_device);
 
-int input_flush_device(struct input_handle* handle, struct file* file)
+int input_flush_device(struct input_handle *handle, struct file *file)
 {
-       if (handle->dev->flush)
-               return handle->dev->flush(handle->dev, file);
+       struct input_dev *dev = handle->dev;
+       int retval;
 
-       return 0;
+       retval = mutex_lock_interruptible(&dev->mutex);
+       if (retval)
+               return retval;
+
+       if (dev->flush)
+               retval = dev->flush(dev, file);
+
+       mutex_unlock(&dev->mutex);
+       return retval;
 }
 EXPORT_SYMBOL(input_flush_device);
 
+/**
+ * input_close_device - close input device
+ * @handle: handle through which device is being accessed
+ *
+ * This function should be called by input handlers when they
+ * want to stop receive events from given input device.
+ */
 void input_close_device(struct input_handle *handle)
 {
        struct input_dev *dev = handle->dev;
 
-       input_release_device(handle);
-
        mutex_lock(&dev->mutex);
 
+       __input_release_device(handle);
+
        if (!--dev->users && dev->close)
                dev->close(dev);
-       handle->open--;
+
+       if (!--handle->open) {
+               /*
+                * synchronize_sched() makes sure that input_pass_event()
+                * completed and that no more input events are delivered
+                * through this handle
+                */
+               synchronize_sched();
+       }
 
        mutex_unlock(&dev->mutex);
 }
 EXPORT_SYMBOL(input_close_device);
 
+/*
+ * Prepare device for unregistering
+ */
+static void input_disconnect_device(struct input_dev *dev)
+{
+       struct input_handle *handle;
+       int code;
+
+       /*
+        * Mark device as going away. Note that we take dev->mutex here
+        * not to protect access to dev->going_away but rather to ensure
+        * that there are no threads in the middle of input_open_device()
+        */
+       mutex_lock(&dev->mutex);
+       dev->going_away = 1;
+       mutex_unlock(&dev->mutex);
+
+       spin_lock_irq(&dev->event_lock);
+
+       /*
+        * Simulate keyup events for all pressed keys so that handlers
+        * are not left with "stuck" keys. The driver may continue
+        * generate events even after we done here but they will not
+        * reach any handlers.
+        */
+       if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
+               for (code = 0; code <= KEY_MAX; code++) {
+                       if (is_event_supported(code, dev->keybit, KEY_MAX) &&
+                           test_bit(code, dev->key)) {
+                               input_pass_event(dev, EV_KEY, code, 0);
+                       }
+               }
+               input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+       }
+
+       list_for_each_entry(handle, &dev->h_list, d_node)
+               handle->open = 0;
+
+       spin_unlock_irq(&dev->event_lock);
+}
+
 static int input_fetch_keycode(struct input_dev *dev, int scancode)
 {
        switch (dev->keycodesize) {
@@ -473,7 +678,8 @@ static unsigned int input_proc_devices_poll(struct file 
*file, poll_table *wait)
 
 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 {
-       /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
+       if (mutex_lock_interruptible(&input_mutex))
+               return NULL;
 
        return seq_list_start(&input_dev_list, *pos);
 }
@@ -485,7 +691,7 @@ static void *input_devices_seq_next(struct seq_file *seq, 
void *v, loff_t *pos)
 
 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 {
-       /* release lock here */
+       mutex_unlock(&input_mutex);
 }
 
 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
@@ -569,7 +775,9 @@ static const struct file_operations input_devices_fileops = 
{
 
 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 {
-       /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
+       if (mutex_lock_interruptible(&input_mutex))
+               return NULL;
+
        seq->private = (void *)(unsigned long)*pos;
        return seq_list_start(&input_handler_list, *pos);
 }
@@ -582,7 +790,7 @@ static void *input_handlers_seq_next(struct seq_file *seq, 
void *v, loff_t *pos)
 
 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 {
-       /* release lock here */
+       mutex_unlock(&input_mutex);
 }
 
 static int input_handlers_seq_show(struct seq_file *seq, void *v)
@@ -1005,6 +1213,7 @@ struct input_dev *input_allocate_device(void)
                dev->dev.class = &input_class;
                device_initialize(&dev->dev);
                mutex_init(&dev->mutex);
+               spin_lock_init(&dev->event_lock);
                INIT_LIST_HEAD(&dev->h_list);
                INIT_LIST_HEAD(&dev->node);
 
@@ -1022,7 +1231,7 @@ EXPORT_SYMBOL(input_allocate_device);
  * This function should only be used if input_register_device()
  * was not called yet or if it failed. Once device was registered
  * use input_unregister_device() and memory will be freed once last
- * refrence to the device is dropped.
+ * reference to the device is dropped.
  *
  * Device should be allocated by input_allocate_device().
  *
@@ -1092,6 +1301,18 @@ void input_set_capability(struct input_dev *dev, 
unsigned int type, unsigned int
 }
 EXPORT_SYMBOL(input_set_capability);
 
+/**
+ * input_register_device - register device with input core
+ * @dev: device to be registered
+ *
+ * This function registers device with input core. The device must be
+ * allocated with input_allocate_device() and all it's capabilities
+ * set up before registering.
+ * If function fails the device must be freed with input_free_device().
+ * Once device has been successfully registered it can be unregistered
+ * with input_unregister_device(); input_free_device() should not be
+ * called in this case.
+ */
 int input_register_device(struct input_dev *dev)
 {
        static atomic_t input_no = ATOMIC_INIT(0);
@@ -1099,7 +1320,7 @@ int input_register_device(struct input_dev *dev)
        const char *path;
        int error;
 
-       set_bit(EV_SYN, dev->evbit);
+       __set_bit(EV_SYN, dev->evbit);
 
        /*
         * If delay and period are pre-set by the driver, then autorepeating
@@ -1120,8 +1341,6 @@ int input_register_device(struct input_dev *dev)
        if (!dev->setkeycode)
                dev->setkeycode = input_default_setkeycode;
 
-       list_add_tail(&dev->node, &input_dev_list);
-
        snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
                 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
 
@@ -1137,49 +1356,79 @@ int input_register_device(struct input_dev *dev)
                dev->name ? dev->name : "Unspecified device", path ? path : 
"N/A");
        kfree(path);
 
+       error = mutex_lock_interruptible(&input_mutex);
+       if (error) {
+               device_del(&dev->dev);
+               return error;
+       }
+
+       list_add_tail(&dev->node, &input_dev_list);
+
        list_for_each_entry(handler, &input_handler_list, node)
                input_attach_handler(dev, handler);
 
        input_wakeup_procfs_readers();
 
+       mutex_unlock(&input_mutex);
+
        return 0;
 }
 EXPORT_SYMBOL(input_register_device);
 
+/**
+ * input_unregister_device - unregister previously registered device
+ * @dev: device to be unregistered
+ *
+ * This function unregisters an input device. Once device is unregistered
+ * the caller should not try to access it as it may get freed at any moment.
+ */
 void input_unregister_device(struct input_dev *dev)
 {
        struct input_handle *handle, *next;
-       int code;
 
-       for (code = 0; code <= KEY_MAX; code++)
-               if (test_bit(code, dev->key))
-                       input_report_key(dev, code, 0);
-       input_sync(dev);
+       input_disconnect_device(dev);
 
-       del_timer_sync(&dev->timer);
+       mutex_lock(&input_mutex);
 
        list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
                handle->handler->disconnect(handle);
        WARN_ON(!list_empty(&dev->h_list));
 
+       del_timer_sync(&dev->timer);
        list_del_init(&dev->node);
 
-       device_unregister(&dev->dev);
-
        input_wakeup_procfs_readers();
+
+       mutex_unlock(&input_mutex);
+
+       device_unregister(&dev->dev);
 }
 EXPORT_SYMBOL(input_unregister_device);
 
+/**
+ * input_register_handler - register a new input handler
+ * @handler: handler to be registered
+ *
+ * This function registers a new input handler (interface) for input
+ * devices in the system and attaches it to all input devices that
+ * are compatible with the handler.
+ */
 int input_register_handler(struct input_handler *handler)
 {
        struct input_dev *dev;
+       int retval;
+
+       retval = mutex_lock_interruptible(&input_mutex);
+       if (retval)
+               return retval;
 
        INIT_LIST_HEAD(&handler->h_list);
 
        if (handler->fops != NULL) {
-               if (input_table[handler->minor >> 5])
-                       return -EBUSY;
-
+               if (input_table[handler->minor >> 5]) {
+                       retval = -EBUSY;
+                       goto out;
+               }
                input_table[handler->minor >> 5] = handler;
        }
 
@@ -1189,14 +1438,26 @@ int input_register_handler(struct input_handler 
*handler)
                input_attach_handler(dev, handler);
 
        input_wakeup_procfs_readers();
-       return 0;
+
+ out:
+       mutex_unlock(&input_mutex);
+       return retval;
 }
 EXPORT_SYMBOL(input_register_handler);
 
+/**
+ * input_unregister_handler - unregisters an input handler
+ * @handler: handler to be unregistered
+ *
+ * This function disconnects a handler from its input devices and
+ * removes it from lists of known handlers.
+ */
 void input_unregister_handler(struct input_handler *handler)
 {
        struct input_handle *handle, *next;
 
+       mutex_lock(&input_mutex);
+
        list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
                handler->disconnect(handle);
        WARN_ON(!list_empty(&handler->h_list));
@@ -1207,14 +1468,50 @@ void input_unregister_handler(struct input_handler 
*handler)
                input_table[handler->minor >> 5] = NULL;
 
        input_wakeup_procfs_readers();
+
+       mutex_unlock(&input_mutex);
 }
 EXPORT_SYMBOL(input_unregister_handler);
 
+/**
+ * input_register_handle - register a new input handle
+ * @handle: handle to register
+ *
+ * This function puts a new input handle onto device's
+ * and handler's lists so that events can flow through
+ * it once it is opened using input_open_device().
+ *
+ * This function is supposed to be called from handler's
+ * connect() method.
+ */
 int input_register_handle(struct input_handle *handle)
 {
        struct input_handler *handler = handle->handler;
+       struct input_dev *dev = handle->dev;
+       int error;
+
+       /*
+        * We take dev->mutex here to prevent race with
+        * input_release_device().
+        */
+       error = mutex_lock_interruptible(&dev->mutex);
+       if (error)
+               return error;
+       list_add_tail_rcu(&handle->d_node, &dev->h_list);
+       mutex_unlock(&dev->mutex);
+       /*
+        * We don't use synchronize_rcu() here because we rely
+        * on dev->event_lock to protect read-side critical
+        * section in input_pass_event().
+        */
+       synchronize_sched();
 
-       list_add_tail(&handle->d_node, &handle->dev->h_list);
+       /*
+        * Since we are supposed to be called from ->connect()
+        * which is mutually exclusive with ->disconnect()
+        * we can't be racing with input_unregister_handle()
+        * and so separate lock is not needed here.
+        */
        list_add_tail(&handle->h_node, &handler->h_list);
 
        if (handler->start)
@@ -1224,10 +1521,29 @@ int input_register_handle(struct input_handle *handle)
 }
 EXPORT_SYMBOL(input_register_handle);
 
+/**
+ * input_unregister_handle - unregister an input handle
+ * @handle: handle to unregister
+ *
+ * This function removes input handle from device's
+ * and handler's lists.
+ *
+ * This function is supposed to be called from handler's
+ * disconnect() method.
+ */
 void input_unregister_handle(struct input_handle *handle)
 {
+       struct input_dev *dev = handle->dev;
+
        list_del_init(&handle->h_node);
-       list_del_init(&handle->d_node);
+
+       /*
+        * Take dev->mutex to prevent race with input_release_device().
+        */
+       mutex_lock(&dev->mutex);
+       list_del_rcu(&handle->d_node);
+       mutex_unlock(&dev->mutex);
+       synchronize_sched();
 }
 EXPORT_SYMBOL(input_unregister_handle);
 
diff --git a/include/linux/input.h b/include/linux/input.h
index adfbe4f..d09e5e8 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -845,7 +845,7 @@ struct ff_rumble_effect {
  *     defining effect parameters
  *
  * This structure is sent through ioctl from the application to the driver.
- * To create a new effect aplication should set its @id to -1; the kernel
+ * To create a new effect application should set its @id to -1; the kernel
  * will return assigned @id which can later be used to update or delete
  * this effect.
  *
@@ -925,9 +925,82 @@ struct ff_effect {
 #define BIT(x) (1UL<<((x)%BITS_PER_LONG))
 #define LONG(x) ((x)/BITS_PER_LONG)
 
+/**
+ * struct input_dev - represents an input device
+ * @name: name of the device
+ * @phys: physical path to the device in the system hierarchy
+ * @uniq: unique identification code for the device (if device has it)
+ * @id: id of the device (struct input_id)
+ * @evbit: bitmap of types of events supported by the device (EV_KEY,
+ *     EV_REL, etc.)
+ * @keybit: bitmap of keys/buttons this device has
+ * @relbit: bitmap of relative axes for the device
+ * @absbit: bitmap of absolute axes for the device
+ * @mscbit: bitmap of miscellaneous events supported by the device
+ * @ledbit: bitmap of leds present on the device
+ * @sndbit: bitmap of sound effects supported by the device
+ * @ffbit: bitmap of force feedback effects supported by the device
+ * @swbit: bitmap of switches present on the device
+ * @keycodemax: size of keycode table
+ * @keycodesize: size of elements in keycode table
+ * @keycode: map of scancodes to keycodes for this device
+ * @setkeycode: optional method to alter current keymap, used to implement
+ *     sparse keymaps. If not supplied default mechanism will be used
+ * @getkeycode: optional method to retrieve current keymap. If not supplied
+ *     default mechanism will be used
+ * @ff: force feedback structure associated with the device if device
+ *     supports force feedback effects
+ * @repeat_key: stores key code of the last key pressed; used to implement
+ *     software autorepeat
+ * @timer: timer for software autorepeat
+ * @sync: set to 1 when there were no new events since last EV_SYNC
+ * @abs: current values for reports from absolute axes
+ * @rep: current values for autorepeat parameters (delay, rate)
+ * @key: reflects current state of device's keys/buttons
+ * @led: reflects current state of device's LEDs
+ * @snd: reflects current state of sound effects
+ * @sw: reflects current state of device's switches
+ * @absmax: maximum values for events coming from absolute axes
+ * @absmin: minimum values for events coming from absolute axes
+ * @absfuzz: describes noisiness for axes
+ * @absflat: size of the center flat position (used by joydev)
+ * @open: this method is called when the very first user calls
+ *     input_open_device(). The driver must prepare the device
+ *     to start generating events (start polling thread,
+ *     request an IRQ, submit URB, etc.)
+ * @close: this method is called when the very last user calls
+ *     input_close_device().
+ * @flush: purges the device. Most commonly used to get rid of force
+ *     feedback effects loaded into the device when disconnecting
+ *     from it
+ * @event: event handler for events sent _to_ the device, like EV_LED
+ *     or EV_SND. The device is expected to carry out the requested
+ *     action (turn on a LED, play sound, etc.) The call is protected
+ *     by @event_lock and must not sleep
+ * @grab: input handle that currently has the device grabbed (via
+ *     EVIOCGRAB ioctl). When a handle grabs a device it becomes sole
+ *     recipient for all input events coming from the device
+ * @event_lock: this spinlock is is taken when input core receives
+ *     and processes a new event for the device (in input_event()).
+ *     Code that accesses and/or modifies parameters of a device
+ *     (such as keymap or absmin, absmax, absfuzz, etc.) after device
+ *     has been registered with input core must take this lock.
+ * @mutex: serializes calls to open(), close() and flush() methods
+ * @users: stores number of users (input handlers) that opened this
+ *     device. It is used by input_open_device() and input_close_device()
+ *     to make sure that dev->open() is only called when the first
+ *     user opens device and dev->close() is called when the very
+ *     last user closes the device
+ * @going_away: marks devices that are in a middle of unregistering and
+ *     causes input_open_device*() fail with -ENODEV.
+ * @dev: driver model's view of this device
+ * @h_list: list of input handles associated with the device. When
+ *     accessing the list dev->mutex must be held
+ * @node: used to place the device onto input_dev_list
+ */
 struct input_dev {
 
-       void *private;
+       void *private;  /* do not use */
 
        const char *name;
        const char *phys;
@@ -955,8 +1028,6 @@ struct input_dev {
        unsigned int repeat_key;
        struct timer_list timer;
 
-       int state;
-
        int sync;
 
        int abs[ABS_MAX + 1];
@@ -979,8 +1050,11 @@ struct input_dev {
 
        struct input_handle *grab;
 
-       struct mutex mutex;     /* serializes open and close operations */
+       spinlock_t event_lock;
+       struct mutex mutex;
+
        unsigned int users;
+       int going_away;
 
        struct device dev;
        union {                 /* temporarily so while we switching to struct 
device */
@@ -1046,7 +1120,9 @@ struct input_handle;
 /**
  * struct input_handler - implements one of interfaces for input devices
  * @private: driver-specific data
- * @event: event handler
+ * @event: event handler. This method is being called by input core with
+ *     interrupts disabled and dev->event_lock spinlock held and so
+ *     it may not sleep
  * @connect: called when attaching a handler to an input device
  * @disconnect: disconnects a handler from input device
  * @start: starts handler for given handle. This function is called by
@@ -1058,10 +1134,18 @@ struct input_handle;
  * @name: name of the handler, to be shown in /proc/bus/input/handlers
  * @id_table: pointer to a table of input_device_ids this driver can
  *     handle
- * @blacklist: prointer to a table of input_device_ids this driver should
+ * @blacklist: pointer to a table of input_device_ids this driver should
  *     ignore even if they match @id_table
  * @h_list: list of input handles associated with the handler
  * @node: for placing the driver onto input_handler_list
+ *
+ * Input handlers attach to input devices and create input handles. There
+ * are likely several handlers attached to any given input device at the
+ * same time. All of them will get their copy of input event generated by
+ * the device.
+ *
+ * Note that input core serializes calls to connect() and disconnect()
+ * methods.
  */
 struct input_handler {
 
@@ -1083,6 +1167,18 @@ struct input_handler {
        struct list_head        node;
 };
 
+/**
+ * struct input_handle - links input device with an input handler
+ * @private: handler-specific data
+ * @open: counter showing whether the handle is 'open', i.e. should deliver
+ *     events from its device
+ * @name: name given to the handle by handler that created it
+ * @dev: input device the handle is attached to
+ * @handler: handler that works with the device through this handle
+ * @d_node: used to put the handle on device's list of attached handles
+ * @h_node: used to put the handle on handler's list of handles from which
+ *     it gets events
+ */
 struct input_handle {
 
        void *private;
@@ -1205,7 +1301,7 @@ extern struct class input_class;
  * @max_effects: maximum number of effects supported by device
  * @effects: pointer to an array of effects currently loaded into device
  * @effect_owners: array of effect owners; when file handle owning
- *     an effect gets closed the effcet is automatically erased
+ *     an effect gets closed the effect is automatically erased
  *
  * Every force-feedback device must implement upload() and playback()
  * methods; erase() is optional. set_gain() and set_autocenter() need
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to