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

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Date:   Mon, 17 Jan 2022 21:17:54 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ping-Ke Shih <pkshih@...ltek.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Kalle Valo <kvalo@...nel.org>, Sasha Levin <sashal@...nel.org>,
        davem@...emloft.net, kuba@...nel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.16 111/217] rtw89: don't kick off TX DMA if failed to write skb

From: Ping-Ke Shih <pkshih@...ltek.com>

[ 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@...cle.com>
Signed-off-by: Ping-Ke Shih <pkshih@...ltek.com>
Signed-off-by: Kalle Valo <kvalo@...nel.org>
Link: https://lore.kernel.org/r/20211201093816.13806-1-pkshih@realtek.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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