linux-kernel - [PATCH 4.14 53/64] net: qlcnic: add missed unlock in qlcnic_83xx_flash

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Date:   Tue, 24 Aug 2021 13:04:46 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dinghao Liu <dinghao.liu@....edu.cn>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 53/64] net: qlcnic: add missed unlock in qlcnic_83xx_flash_read32

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit 0a298d133893c72c96e2156ed7cb0f0c4a306a3e ]

qlcnic_83xx_unlock_flash() is called on all paths after we call
qlcnic_83xx_lock_flash(), except for one error path on failure
of QLCRD32(), which may cause a deadlock. This bug is suggested
by a static analysis tool, please advise.

Fixes: 81d0aeb0a4fff ("qlcnic: flash template based firmware reset recovery")
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Link: https://lore.kernel.org/r/20210816131405.24024-1-dinghao.liu@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
index aae81226a0a4..4994599728dc 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
@@ -3157,8 +3157,10 @@ int qlcnic_83xx_flash_read32(struct qlcnic_adapter *adapter, u32 flash_addr,
 
 		indirect_addr = QLC_83XX_FLASH_DIRECT_DATA(addr);
 		ret = QLCRD32(adapter, indirect_addr, &err);
-		if (err == -EIO)
+		if (err == -EIO) {
+			qlcnic_83xx_unlock_flash(adapter);
 			return err;
+		}
 
 		word = ret;
 		*(u32 *)p_data  = word;
-- 
2.30.2