[lkml]   [2007]   [Aug]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH] Don't needlessly initialize variable to NULL in zd_chip (was: Re: [PATCH 13/30] net: Don't do pointless kmalloc return value casts in zd1211 driver)
On Friday 31 August 2007 00:19:53 Joe Perches wrote:
> On Thu, 2007-08-30 at 22:20 +0200, Jesper Juhl wrote:
> > Ok, I must admit I didn't check with sparse since it seemed pointless
> > - we usually never cast void pointers to other pointer types,
> > specifically because the C language nicely guarantees that the right
> > thing will happen without the cast. Sometimes we have to cast them to
> > integer types, su sure we need the cast there. But what on earth
> > makes a "zd_addr_t *" so special that we have to explicitly cast a
> > "void *" to that type?

Thank you for that link Joe.

I'm not sure I agree with the __nocast, but I respect that this is
the maintainers choice.

But, I still think the first chunk of the patch that removes the
initial variable initialization makes sense.
Initializing the variable to NULL is pointless since it'll never be
used before the kmalloc() call. So here's a revised patch that just
gets rid of that little detail.

No need to initialize to NULL when variable is never used before
it's assigned the return value of a kmalloc() call.

Signed-off-by: Jesper Juhl <>

diff --git a/drivers/net/wireless/zd1211rw/zd_chip.c b/drivers/net/wireless/zd1211rw/zd_chip.c
index c39f198..30872fe 100644
--- a/drivers/net/wireless/zd1211rw/zd_chip.c
+++ b/drivers/net/wireless/zd1211rw/zd_chip.c
@@ -106,7 +106,7 @@ int zd_ioread32v_locked(struct zd_chip *chip, u32 *values, const zd_addr_t *addr
int r;
int i;
- zd_addr_t *a16 = (zd_addr_t *)NULL;
+ zd_addr_t *a16;
u16 *v16;
unsigned int count16;

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-08-31 00:37    [W:0.058 / U:1.392 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site