Various drivers' irq handlers: kill dead code, needless casts

- Eliminate casts to/from void*

- Eliminate checks for conditions that never occur.  These typically
  fall into two classes:

	1) Checking for 'dev_id == NULL', then it is never called with
	NULL as an argument.

	2) Checking for invalid irq number, when the only caller (the
	system) guarantees the irq handler is called with the proper
	'irq' number argument.

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

8 files changed, 7 insertions, 11 deletions

diff --git a/sound/isa/gus/gusmax.c b/sound/isa/gus/gusmax.c
index 52498c9..c1c69e3 100644
--- a/sound/isa/gus/gusmax.c
+++ b/sound/isa/gus/gusmax.c
@@ -107,7 +107,7 @@ static int __init snd_gusmax_detect(struct snd_gus_card * gus)
 
 static irqreturn_t snd_gusmax_interrupt(int irq, void *dev_id)
 {
-	struct snd_gusmax *maxcard = (struct snd_gusmax *) dev_id;
+	struct snd_gusmax *maxcard = dev_id;
 	int loop, max = 5;
 	int handled = 0;
 
diff --git a/sound/isa/gus/interwave.c b/sound/isa/gus/interwave.c
index 5c474b8..f12cd09 100644
--- a/sound/isa/gus/interwave.c
+++ b/sound/isa/gus/interwave.c
@@ -301,7 +301,7 @@ static int __devinit snd_interwave_detect(struct snd_interwave *iwcard,
 
 static irqreturn_t snd_interwave_interrupt(int irq, void *dev_id)
 {
-	struct snd_interwave *iwcard = (struct snd_interwave *) dev_id;
+	struct snd_interwave *iwcard = dev_id;
 	int loop, max = 5;
 	int handled = 0;
 
diff --git a/sound/oss/es1371.c b/sound/oss/es1371.c
index 2562f47..ddf6b0a 100644
--- a/sound/oss/es1371.c
+++ b/sound/oss/es1371.c
@@ -1102,7 +1102,7 @@ static void es1371_handle_midi(struct es1371_state *s)
 
 static irqreturn_t es1371_interrupt(int irq, void *dev_id)
 {
-        struct es1371_state *s = (struct es1371_state *)dev_id;
+        struct es1371_state *s = dev_id;
 	unsigned int intsrc, sctl;
 	
 	/* fastpath out, to ease interrupt sharing */
diff --git a/sound/oss/hal2.c b/sound/oss/hal2.c
index 7807aba..784bdd7 100644
--- a/sound/oss/hal2.c
+++ b/sound/oss/hal2.c
@@ -372,7 +372,7 @@ static void hal2_adc_interrupt(struct hal2_codec *adc)
 
 static irqreturn_t hal2_interrupt(int irq, void *dev_id)
 {
-	struct hal2_card *hal2 = (struct hal2_card*)dev_id;
+	struct hal2_card *hal2 = dev_id;
 	irqreturn_t ret = IRQ_NONE;
 
 	/* decide what caused this interrupt */
diff --git a/sound/oss/i810_audio.c b/sound/oss/i810_audio.c
index a48af87..240cc79 100644
--- a/sound/oss/i810_audio.c
+++ b/sound/oss/i810_audio.c
@@ -1525,7 +1525,7 @@ static void i810_channel_interrupt(struct i810_card *card)
 
 static irqreturn_t i810_interrupt(int irq, void *dev_id)
 {
-	struct i810_card *card = (struct i810_card *)dev_id;
+	struct i810_card *card = dev_id;
 	u32 status;
 
 	spin_lock(&card->lock);
diff --git a/sound/oss/mpu401.c b/sound/oss/mpu401.c
index 58d4a5d..e962205 100644
--- a/sound/oss/mpu401.c
+++ b/sound/oss/mpu401.c
@@ -435,7 +435,7 @@ static void mpu401_input_loop(struct mpu_config *devc)
 static irqreturn_t mpuintr(int irq, void *dev_id)
 {
 	struct mpu_config *devc;
-	int dev = (int) dev_id;
+	int dev = (int)(unsigned long) dev_id;
 	int handled = 0;
 
 	devc = &dev_conf[dev];
diff --git a/sound/oss/vwsnd.c b/sound/oss/vwsnd.c
index 0cd4d6e..6dfb9f4 100644
--- a/sound/oss/vwsnd.c
+++ b/sound/oss/vwsnd.c
@@ -2235,7 +2235,7 @@ static void vwsnd_audio_write_intr(vwsnd_dev_t *devc, unsigned int status)
 
 static irqreturn_t vwsnd_audio_intr(int irq, void *dev_id)
 {
-	vwsnd_dev_t *devc = (vwsnd_dev_t *) dev_id;
+	vwsnd_dev_t *devc = dev_id;
 	unsigned int status;
 
 	DBGEV("(irq=%d, dev_id=0x%p)\n", irq, dev_id);
diff --git a/sound/pci/korg1212/korg1212.c b/sound/pci/korg1212/korg1212.c
index 398aa10..fa8cd8c 100644
--- a/sound/pci/korg1212/korg1212.c
+++ b/sound/pci/korg1212/korg1212.c
@@ -1124,9 +1124,6 @@ static irqreturn_t snd_korg1212_interrupt(int irq, void *dev_id)
         u32 doorbellValue;
         struct snd_korg1212 *korg1212 = dev_id;
 
-	if(irq != korg1212->irq)
-		return IRQ_NONE;
-
         doorbellValue = readl(korg1212->inDoorbellPtr);
 
         if (!doorbellValue)
@@ -1140,7 +1137,6 @@ static irqreturn_t snd_korg1212_interrupt(int irq, void *dev_id)
 
 	korg1212->inIRQ++;
 
-
         switch (doorbellValue) {
                 case K1212_DB_DSPDownloadDone:
                         K1212_DEBUG_PRINTK("K1212_DEBUG: IRQ DNLD count - %ld, %x, [%s].\n",