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>

2 files changed, 2 insertions, 2 deletions

diff --git a/sound/isa/gus/gusmax.c b/sound/isa/gus/gusmax.c
index 52498c9d411e..c1c69e3cbfd0 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 5c474b831edc..f12cd09d1fcc 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;