b43: Fix SDIO interrupt handler deadlock

We need to release the SDIO host before locking the driver mutex.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/main.c

@@ -1914,20 +1914,14 @@ static irqreturn_t b43_interrupt_handler(int irq, void *dev_id)
 static void b43_sdio_interrupt_handler(struct b43_wldev *dev)
 {
 	struct b43_wl *wl = dev->wl;
-	struct sdio_func *func = dev->dev->bus->host_sdio;
 	irqreturn_t ret;
 
-	if (unlikely(b43_status(dev) < B43_STAT_STARTED))
-		return;
-
 	mutex_lock(&wl->mutex);
-	sdio_release_host(func);
 
 	ret = b43_do_interrupt(dev);
 	if (ret == IRQ_WAKE_THREAD)
 		b43_do_interrupt_thread(dev);
 
-	sdio_claim_host(func);
 	mutex_unlock(&wl->mutex);
 }
 

drivers/net/wireless/b43/sdio.c

@@ -54,7 +54,12 @@ static void b43_sdio_interrupt_dispatcher(struct sdio_func *func)
 	struct b43_sdio *sdio = sdio_get_drvdata(func);
 	struct b43_wldev *dev = sdio->irq_handler_opaque;
 
+	if (unlikely(b43_status(dev) < B43_STAT_STARTED))
+		return;
+
+	sdio_release_host(func);
 	sdio->irq_handler(dev);
+	sdio_claim_host(func);
 }
 
 int b43_sdio_request_irq(struct b43_wldev *dev,