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USB: FHCI: cq_get() should check kfifo_out()'s return value 

Since commit 7acd72eb85 ("kfifo: rename
kfifo_put... into kfifo_in... and kfifo_get... into kfifo_out..."),
kfifo_out() is marked __must_check, and that causes gcc to produce
lots of warnings like this:

  CC      drivers/usb/host/fhci-mem.o
In file included from drivers/usb/host/fhci-hcd.c:34:
drivers/usb/host/fhci.h: In function 'cq_get':
drivers/usb/host/fhci.h:520: warning: ignoring return value of 'kfifo_out', declared with attribute warn_unused_result
...

This patch fixes the issue by properly checking the return value.

Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
Cc: stable <stable@kernel.org> [.33 and .34]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Anton Vorontsov 2010-05-14 18:33:18 +04:00 committed by Greg Kroah-Hartman
parent 12e7eca963
commit 7f1cccd3ec
1 changed files with 7 additions and 2 deletions
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9
drivers/usb/host/fhci.h
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@ -20,6 +20,7 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bug.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/kfifo.h>
@ -515,9 +516,13 @@ static inline int cq_put(struct kfifo *kfifo, void *p)
static inline void *cq_get(struct kfifo *kfifo)
{
void *p = NULL;
unsigned int sz;
void *p;
sz = kfifo_out(kfifo, (void *)&p, sizeof(p));
if (sz != sizeof(p))
return NULL;
kfifo_out(kfifo, (void *)&p, sizeof(p));
return p;
}