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, 1 insertions, 6 deletions

diff --git a/drivers/net/sonic.c b/drivers/net/sonic.c
index cfece9676aff..ed7aa0a5acca 100644
--- a/drivers/net/sonic.c
+++ b/drivers/net/sonic.c
@@ -295,15 +295,10 @@ static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
  */
 static irqreturn_t sonic_interrupt(int irq, void *dev_id)
 {
-        struct net_device *dev = (struct net_device *) dev_id;
+        struct net_device *dev = dev_id;
         struct sonic_local *lp = netdev_priv(dev);
         int status;
 
-        if (dev == NULL) {
-                printk(KERN_ERR "sonic_interrupt: irq %d for unknown device.\n", irq);
-                return IRQ_NONE;
-        }
-
         if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
                 return IRQ_NONE;