drivers/net: eliminate irq handler impossible checks, needless casts

- Eliminate check for irq handler 'dev_id==NULL' where the
  condition never occurs.

- Eliminate needless casts to/from void*

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 4 insertions, 11 deletions

diff --git a/drivers/net/wireless/wl3501_cs.c b/drivers/net/wireless/wl3501_cs.c
index a1430352169b..5b98a7876982 100644
--- a/drivers/net/wireless/wl3501_cs.c
+++ b/drivers/net/wireless/wl3501_cs.c
@@ -1155,25 +1155,18 @@ static inline void wl3501_ack_interrupt(struct wl3501_card *this)
  */
 static irqreturn_t wl3501_interrupt(int irq, void *dev_id)
 {
-        struct net_device *dev = (struct net_device *)dev_id;
+        struct net_device *dev = dev_id;
         struct wl3501_card *this;
-        int handled = 1;
 
-        if (!dev)
-                goto unknown;
-        this = dev->priv;
+        this = netdev_priv(dev);
         spin_lock(&this->lock);
         wl3501_ack_interrupt(this);
         wl3501_block_interrupt(this);
         wl3501_rx_interrupt(dev);
         wl3501_unblock_interrupt(this);
         spin_unlock(&this->lock);
-out:
-        return IRQ_RETVAL(handled);
-unknown:
-        handled = 0;
-        printk(KERN_ERR "%s: irq %d for unknown device.\n", __FUNCTION__, irq);
-        goto out;
+
+        return IRQ_HANDLED;
 }
 
 static int wl3501_reset_board(struct wl3501_card *this)