[PATCH AUTOSEL 5.16 111/217] rtw89: don't kick off TX DMA if failed to write skb

From: Sasha Levin
Date: Mon Jan 17 2022 - 21:35:51 EST


From: Ping-Ke Shih <pkshih@xxxxxxxxxxx>

[ Upstream commit a58fdb7c843a37d6598204c6513961feefdadc6a ]

This is found by Smatch static checker warning:
drivers/net/wireless/realtek/rtw89/mac80211.c:31 rtw89_ops_tx()
error: uninitialized symbol 'qsel'.

The warning is because 'qsel' isn't filled by rtw89_core_tx_write() due to
failed to write. The way to fix it is to avoid kicking off TX DMA, so add
'return' to the failure case.

Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211201093816.13806-1-pkshih@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/wireless/realtek/rtw89/mac80211.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/realtek/rtw89/mac80211.c b/drivers/net/wireless/realtek/rtw89/mac80211.c
index 16dc6fb7dbb0b..e9d61e55e2d92 100644
--- a/drivers/net/wireless/realtek/rtw89/mac80211.c
+++ b/drivers/net/wireless/realtek/rtw89/mac80211.c
@@ -27,6 +27,7 @@ static void rtw89_ops_tx(struct ieee80211_hw *hw,
if (ret) {
rtw89_err(rtwdev, "failed to transmit skb: %d\n", ret);
ieee80211_free_txskb(hw, skb);
+ return;
}
rtw89_core_tx_kick_off(rtwdev, qsel);
}
--
2.34.1