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>

6 files changed, 10 insertions, 39 deletions

diff --git a/drivers/net/irda/ali-ircc.c b/drivers/net/irda/ali-ircc.c
index 971e2dee1e6..cebf8c374bc 100644
--- a/drivers/net/irda/ali-ircc.c
+++ b/drivers/net/irda/ali-ircc.c
@@ -662,19 +662,13 @@ static int ali_ircc_read_dongle_id (int i, chipio_t *info)
  */
 static irqreturn_t ali_ircc_interrupt(int irq, void *dev_id)
 {
-        struct net_device *dev = (struct net_device *) dev_id;
+        struct net_device *dev = dev_id;
         struct ali_ircc_cb *self;
         int ret;
                 
         IRDA_DEBUG(2, "%s(), ---------------- Start ----------------\n", __FUNCTION__);
                 
-        if (!dev) {
-                IRDA_WARNING("%s: irq %d for unknown device.\n",
-                             ALI_IRCC_DRIVER_NAME, irq);
-                return IRQ_NONE;
-        }       
-        
-        self = (struct ali_ircc_cb *) dev->priv;
+        self = dev->priv;
         
         spin_lock(&self->lock);
         
diff --git a/drivers/net/irda/donauboe.c b/drivers/net/irda/donauboe.c
index 7a9128181e6..636d0630fe0 100644
--- a/drivers/net/irda/donauboe.c
+++ b/drivers/net/irda/donauboe.c
@@ -657,12 +657,6 @@ toshoboe_makemttpacket (struct toshoboe_cb *self, void *buf, int mtt)
   return xbofs;
 }
 
-static int toshoboe_invalid_dev(int irq)
-{
-  printk (KERN_WARNING DRIVER_NAME ": irq %d for unknown device.\n", irq);
-  return 1;
-}
-
 #ifdef USE_PROBE
 /***********************************************************************/
 /* Probe code */
@@ -711,12 +705,9 @@ stuff_byte (__u8 byte, __u8 * buf)
 static irqreturn_t
 toshoboe_probeinterrupt (int irq, void *dev_id)
 {
-  struct toshoboe_cb *self = (struct toshoboe_cb *) dev_id;
+  struct toshoboe_cb *self = dev_id;
   __u8 irqstat;
 
-  if (self == NULL && toshoboe_invalid_dev(irq))
-    return IRQ_NONE;
-
   irqstat = INB (OBOE_ISR);
 
 /* was it us */
diff --git a/drivers/net/irda/irport.c b/drivers/net/irda/irport.c
index 6ea78ececca..654a68b490a 100644
--- a/drivers/net/irda/irport.c
+++ b/drivers/net/irda/irport.c
@@ -766,18 +766,14 @@ static inline void irport_receive(struct irport_cb *self)
  */
 static irqreturn_t irport_interrupt(int irq, void *dev_id) 
 {
-        struct net_device *dev = (struct net_device *) dev_id;
+        struct net_device *dev = dev_id;
         struct irport_cb *self;
         int boguscount = 0;
         int iobase;
         int iir, lsr;
         int handled = 0;
 
-        if (!dev) {
-                IRDA_WARNING("%s() irq %d for unknown device.\n", __FUNCTION__, irq);
-                return IRQ_NONE;
-        }
-        self = (struct irport_cb *) dev->priv;
+        self = dev->priv;
 
         spin_lock(&self->lock);
 
diff --git a/drivers/net/irda/irport.h b/drivers/net/irda/irport.h
index 4393168347e..3f46b84c6c8 100644
--- a/drivers/net/irda/irport.h
+++ b/drivers/net/irda/irport.h
@@ -74,7 +74,7 @@ struct irport_cb {
         /* For piggyback drivers */
         void *priv;                
         void (*change_speed)(void *priv, __u32 speed);
-        int (*interrupt)(int irq, void *dev_id);
+        irqreturn_t (*interrupt)(int irq, void *dev_id);
 };
 
 #endif /* IRPORT_H */
diff --git a/drivers/net/irda/nsc-ircc.c b/drivers/net/irda/nsc-ircc.c
index ea12e999814..29b5ccd29d0 100644
--- a/drivers/net/irda/nsc-ircc.c
+++ b/drivers/net/irda/nsc-ircc.c
@@ -2068,17 +2068,12 @@ static void nsc_ircc_fir_interrupt(struct nsc_ircc_cb *self, int iobase,
  */
 static irqreturn_t nsc_ircc_interrupt(int irq, void *dev_id)
 {
-        struct net_device *dev = (struct net_device *) dev_id;
+        struct net_device *dev = dev_id;
         struct nsc_ircc_cb *self;
         __u8 bsr, eir;
         int iobase;
 
-        if (!dev) {
-                IRDA_WARNING("%s: irq %d for unknown device.\n",
-                             driver_name, irq);
-                return IRQ_NONE;
-        }
-        self = (struct nsc_ircc_cb *) dev->priv;
+        self = dev->priv;
 
         spin_lock(&self->lock); 
 
diff --git a/drivers/net/irda/w83977af_ir.c b/drivers/net/irda/w83977af_ir.c
index b4fb92a7baa..4212657fa4f 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;