> Clearly there's a bug in
> drivers/usb/serial/usb-serial.c:usb_serial_put(). It shouldn't call
> kref_put() while holding a spinlock.
Yes, these functions need to sleep.
Does this work?
Regards
Oliver
---
--- a/drivers/usb/serial/usb-serial.c 2007-07-23 08:47:35.000000000 +0200
+++ b/drivers/usb/serial/usb-serial.c 2007-07-24 09:33:15.000000000 +0200
@@ -60,19 +60,19 @@ static struct usb_driver usb_serial_driv
static int debug;
static struct usb_serial *serial_table[SERIAL_TTY_MINORS]; /* initially
all NULL */
-static spinlock_t table_lock;
+DEFINE_MUTEX(table_lock);
static LIST_HEAD(usb_serial_driver_list);
struct usb_serial *usb_serial_get_by_index(unsigned index)
{
struct usb_serial *serial;
- spin_lock(&table_lock);
+ mutex_lock(&table_lock);
serial = serial_table[index];
if (serial)
kref_get(&serial->kref);
- spin_unlock(&table_lock);
+ mutex_unlock(&table_lock);
return serial;
}
@@ -84,7 +84,7 @@ static struct usb_serial *get_free_seria
dbg("%s %d", __FUNCTION__, num_ports);
*minor = 0;
- spin_lock(&table_lock);
+ mutex_lock(&table_lock);
for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
if (serial_table[i])
continue;
@@ -106,10 +106,10 @@ static struct usb_serial *get_free_seria
serial_table[i] = serial;
serial->port[j++]->number = i;
}
- spin_unlock(&table_lock);
+ mutex_unlock(&table_lock);
return serial;
}
- spin_unlock(&table_lock);
+ mutex_unlock(&table_lock);
return NULL;
}
@@ -172,9 +172,9 @@ static void destroy_serial(struct kref *
void usb_serial_put(struct usb_serial *serial)
{
- spin_lock(&table_lock);
+ mutex_lock(&table_lock);
kref_put(&serial->kref, destroy_serial);
- spin_unlock(&table_lock);
+ mutex_unlock(&table_lock);
}
/*****************************************************************************
@@ -1128,7 +1128,6 @@ static int __init usb_serial_init(void)
return -ENOMEM;
/* Initialize our global data */
- spin_lock_init(&table_lock);
for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
serial_table[i] = NULL;
}
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