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, 2 insertions, 7 deletions

diff --git a/drivers/net/irda/w83977af_ir.c b/drivers/net/irda/w83977af_ir.c
index b4fb92a7baa8..4212657fa4f9 100644
--- a/drivers/net/irda/w83977af_ir.c
+++ b/drivers/net/irda/w83977af_ir.c
@@ -1113,17 +1113,12 @@ static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
  */
 static irqreturn_t w83977af_interrupt(int irq, void *dev_id)
 {
-        struct net_device *dev = (struct net_device *) dev_id;
+        struct net_device *dev = dev_id;
         struct w83977af_ir *self;
         __u8 set, icr, isr;
         int iobase;
 
-        if (!dev) {
-                printk(KERN_WARNING "%s: irq %d for unknown device.\n", 
-                        driver_name, irq);
-                return IRQ_NONE;
-        }
-        self = (struct w83977af_ir *) dev->priv;
+        self = dev->priv;
 
         iobase = self->io.fir_base;