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

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Message-Id: <20200130015905.18610-1-natechancellor@gmail.com>
Date:   Wed, 29 Jan 2020 18:59:05 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>,
        ci_notify@...aro.org
Subject: [PATCH] ath11k: Silence clang -Wsometimes-uninitialized in ath11k_update_per_peer_stats_from_txcompl

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>
---
 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