| Message ID | 20200130015905.18610-1-natechancellor@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ath11k: Silence clang -Wsometimes-uninitialized in ath11k_update_per_peer_stats_from_txcompl | expand |
On Thu, Jan 30, 2020 at 1:59 AM Nathan Chancellor <natechancellor@gmail.com> wrote: > > Clang warns a few times (trimmed for brevity): > > ../drivers/net/wireless/ath/ath11k/debugfs_sta.c:185:7: warning: > variable 'rate_idx' is used uninitialized whenever 'if' condition is > false [-Wsometimes-uninitialized] > > It is not wrong, rate_idx is only initialized in the first if block. > However, this is not necessarily an issue in practice because rate_idx > will only be used when initialized because > ath11k_accumulate_per_peer_tx_stats only uses rate_idx when flags is not > set to RATE_INFO_FLAGS_HE_MCS, RATE_INFO_FLAGS_VHT_MCS, or > RATE_INFO_FLAGS_MCS. Still, it is not good to stick uninitialized values > into another function so initialize it to zero to prevent any issues > down the line. > > Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") > Link: https://github.com/ClangBuiltLinux/linux/issues/832 > Reported-by: ci_notify@linaro.org > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Thanks for the patch. A bit tricky to follow that this (previously) is safe. Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> > --- > drivers/net/wireless/ath/ath11k/debugfs_sta.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/wireless/ath/ath11k/debugfs_sta.c b/drivers/net/wireless/ath/ath11k/debugfs_sta.c > index 743760c9bcae..a5bdd16d6d46 100644 > --- a/drivers/net/wireless/ath/ath11k/debugfs_sta.c > +++ b/drivers/net/wireless/ath/ath11k/debugfs_sta.c > @@ -136,7 +136,7 @@ void ath11k_update_per_peer_stats_from_txcompl(struct ath11k *ar, > struct ath11k_sta *arsta; > struct ieee80211_sta *sta; > u16 rate; > - u8 rate_idx; > + u8 rate_idx = 0; > int ret; > u8 mcs; > > -- > 2.25.0 > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200130015905.18610-1-natechancellor%40gmail.com.
Nathan Chancellor <natechancellor@gmail.com> wrote: > Clang warns a few times (trimmed for brevity): > > ../drivers/net/wireless/ath/ath11k/debugfs_sta.c:185:7: warning: > variable 'rate_idx' is used uninitialized whenever 'if' condition is > false [-Wsometimes-uninitialized] > > It is not wrong, rate_idx is only initialized in the first if block. > However, this is not necessarily an issue in practice because rate_idx > will only be used when initialized because > ath11k_accumulate_per_peer_tx_stats only uses rate_idx when flags is not > set to RATE_INFO_FLAGS_HE_MCS, RATE_INFO_FLAGS_VHT_MCS, or > RATE_INFO_FLAGS_MCS. Still, it is not good to stick uninitialized values > into another function so initialize it to zero to prevent any issues > down the line. > > Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") > Link: https://github.com/ClangBuiltLinux/linux/issues/832 > Reported-by: ci_notify@linaro.org > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> > Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> > Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Patch applied to ath-next branch of ath.git, thanks. df57acc415b1 ath11k: Silence clang -Wsometimes-uninitialized in ath11k_update_per_peer_stats_from_txcompl
Hi Kalle, I still see this warning in KernelCI builds of linux-next. Is ath-next flowing into linux-next? I just want to triple check that this fix gets sent along. On Tue, Feb 11, 2020 at 6:24 AM Kalle Valo <kvalo@codeaurora.org> wrote: > > Nathan Chancellor <natechancellor@gmail.com> wrote: > > > Clang warns a few times (trimmed for brevity): > > > > ../drivers/net/wireless/ath/ath11k/debugfs_sta.c:185:7: warning: > > variable 'rate_idx' is used uninitialized whenever 'if' condition is > > false [-Wsometimes-uninitialized] > > > > It is not wrong, rate_idx is only initialized in the first if block. > > However, this is not necessarily an issue in practice because rate_idx > > will only be used when initialized because > > ath11k_accumulate_per_peer_tx_stats only uses rate_idx when flags is not > > set to RATE_INFO_FLAGS_HE_MCS, RATE_INFO_FLAGS_VHT_MCS, or > > RATE_INFO_FLAGS_MCS. Still, it is not good to stick uninitialized values > > into another function so initialize it to zero to prevent any issues > > down the line. > > > > Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") > > Link: https://github.com/ClangBuiltLinux/linux/issues/832 > > Reported-by: ci_notify@linaro.org > > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> > > Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> > > Signed-off-by: Kalle Valo <kvalo@codeaurora.org> > > Patch applied to ath-next branch of ath.git, thanks. > > df57acc415b1 ath11k: Silence clang -Wsometimes-uninitialized in ath11k_update_per_peer_stats_from_txcompl > > -- > https://patchwork.kernel.org/patch/11357331/ > > https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200211142431.243E6C433A2%40smtp.codeaurora.org.
Nick Desaulniers <ndesaulniers@google.com> writes: > Hi Kalle, I still see this warning in KernelCI builds of linux-next. > Is ath-next flowing into linux-next? I just want to triple check that > this fix gets sent along. ath-next is not pulled to linux-next. But this commit is in wireless-drivers-next now and that tree is pulled to linux-next.
diff --git a/drivers/net/wireless/ath/ath11k/debugfs_sta.c b/drivers/net/wireless/ath/ath11k/debugfs_sta.c index 743760c9bcae..a5bdd16d6d46 100644 --- a/drivers/net/wireless/ath/ath11k/debugfs_sta.c +++ b/drivers/net/wireless/ath/ath11k/debugfs_sta.c @@ -136,7 +136,7 @@ void ath11k_update_per_peer_stats_from_txcompl(struct ath11k *ar, struct ath11k_sta *arsta; struct ieee80211_sta *sta; u16 rate; - u8 rate_idx; + u8 rate_idx = 0; int ret; u8 mcs;
Clang warns a few times (trimmed for brevity): ../drivers/net/wireless/ath/ath11k/debugfs_sta.c:185:7: warning: variable 'rate_idx' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] It is not wrong, rate_idx is only initialized in the first if block. However, this is not necessarily an issue in practice because rate_idx will only be used when initialized because ath11k_accumulate_per_peer_tx_stats only uses rate_idx when flags is not set to RATE_INFO_FLAGS_HE_MCS, RATE_INFO_FLAGS_VHT_MCS, or RATE_INFO_FLAGS_MCS. Still, it is not good to stick uninitialized values into another function so initialize it to zero to prevent any issues down the line. Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") Link: https://github.com/ClangBuiltLinux/linux/issues/832 Reported-by: ci_notify@linaro.org Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> --- drivers/net/wireless/ath/ath11k/debugfs_sta.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)