linux-kernel - [PATCH AUTOSEL 6.12 034/486] mctp: Fix incorrect tx flow invalidation condition in mctp-i2c

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Message-Id: <20250505223922.2682012-34-sashal@kernel.org>
Date: Mon,  5 May 2025 18:31:50 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Daniel Hsu <d486250@...il.com>,
	Daniel Hsu <Daniel-Hsu@...ntatw.com>,
	Jeremy Kerr <jk@...econstruct.com.au>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>,
	matt@...econstruct.com.au,
	andrew+netdev@...n.ch,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 034/486] mctp: Fix incorrect tx flow invalidation condition in mctp-i2c

From: Daniel Hsu <d486250@...il.com>

[ Upstream commit 70facbf978ac90c6da17a3de2a8dd111b06f1bac ]

Previously, the condition for invalidating the tx flow in
mctp_i2c_invalidate_tx_flow() checked if `rc` was nonzero.
However, this could incorrectly trigger the invalidation
even when `rc > 0` was returned as a success status.

This patch updates the condition to explicitly check for `rc < 0`,
ensuring that only error cases trigger the invalidation.

Signed-off-by: Daniel Hsu <Daniel-Hsu@...ntatw.com>
Reviewed-by: Jeremy Kerr <jk@...econstruct.com.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/mctp/mctp-i2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mctp/mctp-i2c.c b/drivers/net/mctp/mctp-i2c.c
index 6622de48fc9e7..503a9174321c6 100644
--- a/drivers/net/mctp/mctp-i2c.c
+++ b/drivers/net/mctp/mctp-i2c.c
@@ -538,7 +538,7 @@ static void mctp_i2c_xmit(struct mctp_i2c_dev *midev, struct sk_buff *skb)
 		rc = __i2c_transfer(midev->adapter, &msg, 1);
 
 		/* on tx errors, the flow can no longer be considered valid */
-		if (rc)
+		if (rc < 0)
 			mctp_i2c_invalidate_tx_flow(midev, skb);
 
 		break;
-- 
2.39.5