A patch converting b43 to threaded interrupts will be merged soon.
This will completely break b43 on compat-wireless, because working
threaded IRQ support requires kernel >= 2.6.31.
This patchset implements a workqueue based workaround wrapper, which
works on kernels with and without threaded IRQ support.
It's split up into a generic header and a b43 specific patch.
The generic header needs to be put somewhere into the compat include search
path. The b43 specific patch needs to be applied to compat-b43.
(The #include for the header file will also need to be adjusted)
--
Greetings, Michael.
Index: wireless-testing/drivers/net/wireless/b43/main.c
===================================================================
--- wireless-testing.orig/drivers/net/wireless/b43/main.c 2009-09-06 19:48:52.000000000 +0200
+++ wireless-testing/drivers/net/wireless/b43/main.c 2009-09-06 19:54:28.000000000 +0200
@@ -3841,7 +3841,7 @@ redo:
/* Synchronize the interrupt handlers. Unlock to avoid deadlocks. */
orig_dev = dev;
mutex_unlock(&wl->mutex);
- synchronize_irq(dev->dev->irq);
+ compat_synchronize_threaded_irq(&dev->irq_compat);
mutex_lock(&wl->mutex);
dev = wl->current_dev;
if (!dev)
@@ -3858,7 +3858,7 @@ redo:
dev_kfree_skb(skb_dequeue(&wl->tx_queue));
b43_mac_suspend(dev);
- free_irq(dev->dev->irq, dev);
+ compat_free_threaded_irq(&dev->irq_compat);
b43_leds_exit(dev);
b43dbg(wl, "Wireless interface stopped\n");
@@ -3873,9 +3873,11 @@ static int b43_wireless_core_start(struc
B43_WARN_ON(b43_status(dev) != B43_STAT_INITIALIZED);
drain_txstatus_queue(dev);
- err = request_threaded_irq(dev->dev->irq, b43_interrupt_handler,
- b43_interrupt_thread_handler,
- IRQF_SHARED, KBUILD_MODNAME, dev);
+ err = compat_request_threaded_irq(&dev->irq_compat,
+ dev->dev->irq,
+ b43_interrupt_handler,
+ b43_interrupt_thread_handler,
+ IRQF_SHARED, KBUILD_MODNAME, dev);
if (err) {
b43err(dev->wl, "Cannot request IRQ-%d\n", dev->dev->irq);
goto out;
@@ -4576,6 +4578,7 @@ static int b43_setup_bands(struct b43_wl
static void b43_wireless_core_detach(struct b43_wldev *dev)
{
+ compat_destroy_threaded_irq(&dev->irq_compat);
/* We release firmware that late to not be required to re-request
* is all the time when we reinit the core. */
b43_release_firmware(dev);
Index: wireless-testing/drivers/net/wireless/b43/b43.h
===================================================================
--- wireless-testing.orig/drivers/net/wireless/b43/b43.h 2009-09-06 19:48:52.000000000 +0200
+++ wireless-testing/drivers/net/wireless/b43/b43.h 2009-09-06 19:49:46.000000000 +0200
@@ -7,6 +7,7 @@
#include <linux/hw_random.h>
#include <linux/ssb/ssb.h>
#include <net/mac80211.h>
+#include <linux/compat-threaded-irq.h>
#include "debugfs.h"
#include "leds.h"
@@ -818,6 +819,8 @@ struct b43_wldev {
#ifdef CONFIG_B43_DEBUG
struct b43_dfsentry *dfsentry;
#endif
+
+ struct compat_threaded_irq irq_compat;
};
static inline struct b43_wl *hw_to_b43_wl(struct ieee80211_hw *hw)
#ifndef LINUX_COMPAT_THREADED_IRQ_H_
#define LINUX_COMPAT_THREADED_IRQ_H_
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)
# define USE_COMP_THREADED_IRQ 1
# warning "Using compat threaded IRQ"
#else
# define USE_COMP_THREADED_IRQ 0
#endif
struct compat_threaded_irq {
unsigned int irq;
irq_handler_t handler;
irq_handler_t thread_fn;
void *dev_id;
char wq_name[64];
struct workqueue_struct *wq;
struct work_struct work;
};
static inline
void compat_irq_work(struct work_struct *work)
{
struct compat_threaded_irq *comp = container_of(work, struct compat_threaded_irq, work);
comp->thread_fn(comp->irq, comp->dev_id);
}
static inline
irqreturn_t compat_irq_dispatcher(int irq, void *dev_id)
{
struct compat_threaded_irq *comp = dev_id;
irqreturn_t res;
res = comp->handler(irq, comp->dev_id);
if (res == IRQ_WAKE_THREAD) {
queue_work(comp->wq, &comp->work);
res = IRQ_HANDLED;
}
return res;
}
static inline
int compat_request_threaded_irq(struct compat_threaded_irq *comp,
unsigned int irq,
irq_handler_t handler,
irq_handler_t thread_fn,
unsigned long flags,
const char *name,
void *dev_id)
{
comp->irq = irq;
comp->handler = handler;
comp->thread_fn = thread_fn;
comp->dev_id = dev_id;
INIT_WORK(&comp->work, compat_irq_work);
#if USE_COMP_THREADED_IRQ
if (!comp->wq) {
snprintf(comp->wq_name, sizeof(comp->wq_name),
"compirq/%u-%s", irq, name);
comp->wq = create_singlethread_workqueue(comp->wq_name);
if (!comp->wq) {
printk(KERN_ERR "Failed to create compat-threaded-IRQ workqueue %s\n",
comp->wq_name);
return -ENOMEM;
}
}
return request_irq(irq, compat_irq_dispatcher, flags, name, comp);
#else
return request_threaded_irq(irq, handler, thread_fn, flags, name, dev_id);
#endif
}
static inline
void compat_free_threaded_irq(struct compat_threaded_irq *comp)
{
#if USE_COMP_THREADED_IRQ
free_irq(comp->irq, comp);
#else
free_irq(comp->irq, comp->dev_id);
#endif
}
static inline
void compat_destroy_threaded_irq(struct compat_threaded_irq *comp)
{
#if USE_COMP_THREADED_IRQ
if (comp->wq)
destroy_workqueue(comp->wq);
comp->wq = NULL;
#endif
}
static inline
void compat_synchronize_threaded_irq(struct compat_threaded_irq *comp)
{
synchronize_irq(comp->irq);
#if USE_COMP_THREADED_IRQ
cancel_work_sync(&comp->work);
#endif
}
#endif /* LINUX_COMPAT_THREADED_IRQ_H_ */
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