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>

1 files changed, 0 insertions, 4 deletions

diff --git a/drivers/cdrom/mcdx.c b/drivers/cdrom/mcdx.c
index 60e1978ec0ea..f574962f4288 100644
--- a/drivers/cdrom/mcdx.c
+++ b/drivers/cdrom/mcdx.c
@@ -850,10 +850,6 @@ static irqreturn_t mcdx_intr(int irq, void *dev_id)
         struct s_drive_stuff *stuffp = dev_id;
         unsigned char b;
 
-        if (stuffp == NULL) {
-                xwarn("mcdx: no device for intr %d\n", irq);
-                return IRQ_NONE;
-        }
 #ifdef AK2
         if (!stuffp->busy && stuffp->pending)
                 stuffp->int_err = 1;