linux-kernel - [PATCH AUTOSEL 4.19 2/4] i2c: imx-lpi2c: clean rx/tx buffers upon new message

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Message-Id: <20230401014444.3357427-2-sashal@kernel.org>
Date:   Fri, 31 Mar 2023 21:44:42 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Alexander Stein <alexander.stein@...tq-group.com>,
        Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>,
        aisheng.dong@....com, shawnguo@...nel.org,
        linux-i2c@...r.kernel.org, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 2/4] i2c: imx-lpi2c: clean rx/tx buffers upon new message

From: Alexander Stein <alexander.stein@...tq-group.com>

[ Upstream commit 987dd36c0141f6ab9f0fbf14d6b2ec3342dedb2f ]

When start sending a new message clear the Rx & Tx buffer pointers in
order to avoid using stale pointers.

Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
Tested-by: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 06c4c767af322..a4bd49625fad8 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -468,6 +468,8 @@ static int lpi2c_imx_xfer(struct i2c_adapter *adapter,
 		if (num == 1 && msgs[0].len == 0)
 			goto stop;
 
+		lpi2c_imx->rx_buf = NULL;
+		lpi2c_imx->tx_buf = NULL;
 		lpi2c_imx->delivered = 0;
 		lpi2c_imx->msglen = msgs[i].len;
 		init_completion(&lpi2c_imx->complete);
-- 
2.39.2