* [PATCH] [v2] mt76: mt7915: fix unused 'mode' variable
@ 2021-02-26 14:21 Arnd Bergmann
0 siblings, 0 replies; only message in thread
From: Arnd Bergmann @ 2021-02-26 14:21 UTC (permalink / raw)
To: Felix Fietkau, Lorenzo Bianconi, Kalle Valo
Cc: Ryder Lee, Arnd Bergmann, Nick Desaulniers, linux-kernel,
Nathan Chancellor, clang-built-linux, linux-mediatek,
Jakub Kicinski, David S. Miller, linux-arm-kernel
From: Arnd Bergmann <arnd@arndb.de>
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 <arnd@arndb.de>
---
v2: remove the extra 'break;' after return.
---
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 7fb2170a9561..bd798df748ba 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;
--
2.29.2
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