linux-kernel - [PATCH] i2c: tegra: Return if SMBUS message length is zero

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Message-ID: <20250320062201.54070-1-akhilrajeev@nvidia.com>
Date: Thu, 20 Mar 2025 11:52:01 +0530
From: Akhil R <akhilrajeev@...dia.com>
To: <ldewangan@...dia.com>, <digetx@...il.com>, <andi.shyti@...nel.org>,
	<thierry.reding@...il.com>, <jonathanh@...dia.com>, <wsa@...nel.org>,
	<linux-i2c@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Akhil R <akhilrajeev@...dia.com>
Subject: [PATCH] i2c: tegra: Return if SMBUS message length is zero

For SMBUS block read, do not continue to read if the message length
passed from the device is '0'.

Signed-off-by: Akhil R <akhilrajeev@...dia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 87976e99e6d0..273d6aaa427b 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1393,7 +1393,7 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
 		/* If M_RECV_LEN use ContinueXfer to read the first byte */
 		if (msgs[i].flags & I2C_M_RECV_LEN) {
 			ret = tegra_i2c_xfer_msg(i2c_dev, &msgs[i], MSG_END_CONTINUE);
-			if (ret)
+			if (ret || msgs[i].buf[0] == 0)
 				break;
 			/* Set the msg length from first byte */
 			msgs[i].len += msgs[i].buf[0];
-- 
2.43.2