linux-kernel - Re: [PATCH] ath11k: Silence clang -Wsometimes-uninitialized in ath11k_update_per_peer_stats_from

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Date:   Mon, 16 Mar 2020 14:15:17 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        CI Notify <ci_notify@...aro.org>
Subject: Re: [PATCH] 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@...eaurora.org> wrote:
>
> Nathan Chancellor <natechancellor@...il.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@...aro.org
> > Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> > Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> > Signed-off-by: Kalle Valo <kvalo@...eaurora.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
>
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-- 
Thanks,
~Nick Desaulniers