From c490492f15f656340b35cb9e36b9bfdea3539e19 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 26 Feb 2021 15:21:27 +0100 Subject: [PATCH] mt76: mt7915: fix unused 'mode' variable clang points out a possible corner case in the mt7915_tm_set_tx_cont() function if called with invalid arguments: drivers/net/wireless/mediatek/mt76/mt7915/testmode.c:593:2: warning: variable 'mode' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized] default: ^~~~~~~ drivers/net/wireless/mediatek/mt76/mt7915/testmode.c:597:13: note: uninitialized use occurs here rateval = mode << 6 | rate_idx; ^~~~ drivers/net/wireless/mediatek/mt76/mt7915/testmode.c:506:37: note: initialize the variable 'mode' to silence this warning u8 rate_idx = td->tx_rate_idx, mode; ^ Change it to return an error instead of continuing with invalid data here. Fixes: 3f0caa3cbf94 ("mt76: mt7915: add support for continuous tx in testmode") Signed-off-by: Arnd Bergmann Signed-off-by: Kalle Valo --- drivers/net/wireless/mediatek/mt76/mt7915/testmode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/testmode.c b/drivers/net/wireless/mediatek/mt76/mt7915/testmode.c index 7fb2170..bd798df 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/testmode.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/testmode.c @@ -543,7 +543,7 @@ mt7915_tm_set_tx_cont(struct mt7915_phy *phy, bool en) tx_cont->bw = CMD_CBW_20MHZ; break; default: - break; + return -EINVAL; } if (!en) { @@ -591,7 +591,7 @@ mt7915_tm_set_tx_cont(struct mt7915_phy *phy, bool en) mode = MT_PHY_TYPE_HE_MU; break; default: - break; + return -EINVAL; } rateval = mode << 6 | rate_idx; -- 2.7.4