* [PATCH v2] cw1200: fix bogus maybe-uninitialized warning
@ 2016-10-25 20:21 Arnd Bergmann
2016-11-17 6:48 ` [v2] " Kalle Valo
0 siblings, 1 reply; 2+ messages in thread
From: Arnd Bergmann @ 2016-10-25 20:21 UTC (permalink / raw)
To: Solomon Peachy, Kalle Valo
Cc: David Laight, Arnd Bergmann, Johannes Berg, linux-wireless,
netdev, linux-kernel
On x86, the cw1200 driver produces a rather silly warning about the
possible use of the 'ret' variable without an initialization
presumably after being confused by the architecture specific definition
of WARN_ON:
drivers/net/wireless/st/cw1200/wsm.c: In function ‘wsm_handle_rx’:
drivers/net/wireless/st/cw1200/wsm.c:1457:9: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
We have already checked that 'count' is larger than 0 here, so
we know that 'ret' is initialized. Changing the 'for' loop
into do/while also makes this clear to the compiler.
Suggested-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/net/wireless/st/cw1200/wsm.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
v2: rewrite based on David Laight's suggestion, the first version
was completely wrong.
diff --git a/drivers/net/wireless/st/cw1200/wsm.c b/drivers/net/wireless/st/cw1200/wsm.c
index 680d60eabc75..ed93bf3474ec 100644
--- a/drivers/net/wireless/st/cw1200/wsm.c
+++ b/drivers/net/wireless/st/cw1200/wsm.c
@@ -379,7 +379,6 @@ static int wsm_multi_tx_confirm(struct cw1200_common *priv,
{
int ret;
int count;
- int i;
count = WSM_GET32(buf);
if (WARN_ON(count <= 0))
@@ -395,11 +394,10 @@ static int wsm_multi_tx_confirm(struct cw1200_common *priv,
}
cw1200_debug_txed_multi(priv, count);
- for (i = 0; i < count; ++i) {
+ do {
ret = wsm_tx_confirm(priv, buf, link_id);
- if (ret)
- return ret;
- }
+ } while (!ret && --count);
+
return ret;
underflow:
--
2.9.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [v2] cw1200: fix bogus maybe-uninitialized warning
2016-10-25 20:21 [PATCH v2] cw1200: fix bogus maybe-uninitialized warning Arnd Bergmann
@ 2016-11-17 6:48 ` Kalle Valo
0 siblings, 0 replies; 2+ messages in thread
From: Kalle Valo @ 2016-11-17 6:48 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Solomon Peachy, David Laight, Arnd Bergmann, Johannes Berg,
linux-wireless, netdev, linux-kernel
Arnd Bergmann <arnd@arndb.de> wrote:
> On x86, the cw1200 driver produces a rather silly warning about the
> possible use of the 'ret' variable without an initialization
> presumably after being confused by the architecture specific definition
> of WARN_ON:
>
> drivers/net/wireless/st/cw1200/wsm.c: In function ‘wsm_handle_rx’:
> drivers/net/wireless/st/cw1200/wsm.c:1457:9: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> We have already checked that 'count' is larger than 0 here, so
> we know that 'ret' is initialized. Changing the 'for' loop
> into do/while also makes this clear to the compiler.
>
> Suggested-by: David Laight <David.Laight@ACULAB.COM>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Patch applied to wireless-drivers-next.git, thanks.
7fc1503c906f cw1200: fix bogus maybe-uninitialized warning
--
https://patchwork.kernel.org/patch/9395413/
Documentation about submitting wireless patches and checking status
from patchwork:
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2016-11-17 6:48 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-10-25 20:21 [PATCH v2] cw1200: fix bogus maybe-uninitialized warning Arnd Bergmann
2016-11-17 6:48 ` [v2] " Kalle Valo
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.