zd1211rw: reset rx idle timer from tasklet

2.6.38 added WARN_ON(in_irq) in del_timer_sync that triggers on zd1211rw when
reseting rx idle timer in urb completion handler.

Move timer reseting to tasklet.

Signed-off-by: Jussi Kivilinna <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/zd1211rw/zd_usb.c

···
 	usb = urb->context;
 	rx = &usb->rx;
 
-	zd_usb_reset_rx_idle_timer(usb);
+	tasklet_schedule(&rx->reset_timer_tasklet);
 
 	if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
 		/* If there is an old first fragment, we don't care. */
···
 	__zd_usb_disable_rx(usb);
 	mutex_unlock(&rx->setup_mutex);
 
+	tasklet_kill(&rx->reset_timer_tasklet);
 	cancel_delayed_work_sync(&rx->idle_work);
 }
 
···
 	zd_usb_reset_rx(usb);
 }
 
+static void zd_usb_reset_rx_idle_timer_tasklet(unsigned long param)
+{
+	struct zd_usb *usb = (struct zd_usb *)param;
+
+	zd_usb_reset_rx_idle_timer(usb);
+}
+
 void zd_usb_reset_rx_idle_timer(struct zd_usb *usb)
 {
 	struct zd_usb_rx *rx = &usb->rx;
···
 static inline void init_usb_rx(struct zd_usb *usb)
 {
 	struct zd_usb_rx *rx = &usb->rx;
+
 	spin_lock_init(&rx->lock);
 	mutex_init(&rx->setup_mutex);
 	if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
···
 	}
 	ZD_ASSERT(rx->fragment_length == 0);
 	INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler);
+	rx->reset_timer_tasklet.func = zd_usb_reset_rx_idle_timer_tasklet;
+	rx->reset_timer_tasklet.data = (unsigned long)usb;
 }
 
 static inline void init_usb_tx(struct zd_usb *usb)
 {
 	struct zd_usb_tx *tx = &usb->tx;
+
 	spin_lock_init(&tx->lock);
 	atomic_set(&tx->enabled, 0);
 	tx->stopped = 0;

drivers/net/wireless/zd1211rw/zd_usb.h

···
 	spinlock_t lock;
 	struct mutex setup_mutex;
 	struct delayed_work idle_work;
+	struct tasklet_struct reset_timer_tasklet;
 	u8 fragment[2 * USB_MAX_RX_SIZE];
 	unsigned int fragment_length;
 	unsigned int usb_packet_size;