commit befdbc51cc69c01cd412ad2429960b9c3042f97c is the current
wireless-testing head.
This iteration of wireless-testing seems to have grown some
warnings. Some of them come from a new __must_check annotation of
cfg80211_inform_bss, while others are simply unused or uninitialized
variables. In any case, I would prefer not to see them.
Please check the wireless-testing build and attempt to squash any
warnings that can be reasonably squashed. Those who do not do so
will be subject to irritated sighs over IRC, drunken emails about
my new DVD rental service, and accusations of making unwanted sexual
advances toward me. You've been warned.
John
---
CC [M] net/wireless/nl80211.o
net/wireless/nl80211.c: In function ‘nl80211_tx_mgmt’:
net/wireless/nl80211.c:5286:8: warning: ‘hdr’ may be used uninitialized in this function
CC [M] drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.o
drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c: In function ‘wl_inform_ibss’:
drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c:2152:21: warning: ignoring return value of ‘cfg80211_inform_bss’, declared with attribute warn_unused_result
CC [M] drivers/net/wireless/libertas/cfg.o
drivers/net/wireless/libertas/cfg.c: In function ‘lbs_ret_scan’:
drivers/net/wireless/libertas/cfg.c:636:24: warning: ignoring return value of ‘cfg80211_inform_bss’, declared with attribute warn_unused_result
drivers/net/wireless/libertas/cfg.c: In function ‘lbs_join_post’:
drivers/net/wireless/libertas/cfg.c:1766:21: warning: ignoring return value of ‘cfg80211_inform_bss’, declared with attribute warn_unused_result
CC [M] drivers/net/wireless/mwifiex/cfg80211.o
drivers/net/wireless/mwifiex/cfg80211.c: In function ‘mwifiex_cfg80211_inform_ibss_bss’:
drivers/net/wireless/mwifiex/cfg80211.c:803:21: warning: ignoring return value of ‘cfg80211_inform_bss’, declared with attribute warn_unused_result
--
John W. Linville Someday the world will need a hero, and you
[email protected] might be all we have. Be ready.
On Wed, 2011-11-09 at 16:50 -0500, John W. Linville wrote:
> CC [M] net/wireless/nl80211.o
> net/wireless/nl80211.c: In function ‘nl80211_tx_mgmt’:
> net/wireless/nl80211.c:5286:8: warning: ‘hdr’ may be used uninitialized in this function
Hm, my compiler is smarter than yours ;-)
Not quite sure how to fix this best, I'll figure out something. Thanks
for the heads-up.
johannes
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From: Johannes Berg <[email protected]>
John reported the following warning:
net/wireless/nl80211.c: In function ‘nl80211_tx_mgmt’:
net/wireless/nl80211.c:5286:8: warning: ‘hdr’ may be used uninitialized in this function
Evidently, his version of gcc isn't able to see that
when "msg" is initialized, "hdr" must also be. My
gcc, 4.6.1, can actually see that and doesn't warn.
Simply initialize the variable to NULL. That means
if the compiler was ever right we'll crash though so
isn't really optimal since it may hide warnings from
the compiler when somebody modifies this code in the
future.
Reported-by: John Linville <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
---
net/wireless/nl80211.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/wireless/nl80211.c 2011-11-10 09:36:08.000000000 +0100
+++ b/net/wireless/nl80211.c 2011-11-10 09:42:15.000000000 +0100
@@ -5283,7 +5283,7 @@ static int nl80211_tx_mgmt(struct sk_buf
bool channel_type_valid = false;
u32 freq;
int err;
- void *hdr;
+ void *hdr = NULL;
u64 cookie;
struct sk_buff *msg = NULL;
unsigned int wait = 0;
On Wed, Nov 09, 2011 at 05:58:10PM -0600, Larry Finger wrote:
> On 11/09/2011 03:50 PM, John W. Linville wrote:
> >commit befdbc51cc69c01cd412ad2429960b9c3042f97c is the current
> >wireless-testing head.
> >
> >This iteration of wireless-testing seems to have grown some
> >warnings. Some of them come from a new __must_check annotation of
> >cfg80211_inform_bss, while others are simply unused or uninitialized
> >variables. In any case, I would prefer not to see them.
> >
> >Please check the wireless-testing build and attempt to squash any
> >warnings that can be reasonably squashed. Those who do not do so
> >will be subject to irritated sighs over IRC, drunken emails about
> >my new DVD rental service, and accusations of making unwanted sexual
> >advances toward me. You've been warned.
> >
> >John
>
> For the record, what compiler are you using?
[linville-8530p.local]:> gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.5.1/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared
--enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada,lto --enable-plugin --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile
--enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.5.1 20100924 (Red Hat 4.5.1-4) (GCC)
--
John W. Linville Someday the world will need a hero, and you
[email protected] might be all we have. Be ready.
On 11/09/2011 03:50 PM, John W. Linville wrote:
> commit befdbc51cc69c01cd412ad2429960b9c3042f97c is the current
> wireless-testing head.
>
> This iteration of wireless-testing seems to have grown some
> warnings. Some of them come from a new __must_check annotation of
> cfg80211_inform_bss, while others are simply unused or uninitialized
> variables. In any case, I would prefer not to see them.
>
> Please check the wireless-testing build and attempt to squash any
> warnings that can be reasonably squashed. Those who do not do so
> will be subject to irritated sighs over IRC, drunken emails about
> my new DVD rental service, and accusations of making unwanted sexual
> advances toward me. You've been warned.
>
> John
For the record, what compiler are you using?
Larry