linux-kernel - [PATCH 5.10 080/102] iio: imu: inv_icm42600: Fix broken icm42600 (chip id 0 value)

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Date:   Mon, 27 Jun 2022 13:21:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.10 080/102] iio: imu: inv_icm42600: Fix broken icm42600 (chip id 0 value)

From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>

commit 106b391e1b859100a3f38f0ad874236e9be06bde upstream.

The 0 value used for INV_CHIP_ICM42600 was not working since the
match in i2c/spi was checking against NULL value.

To keep this check, add a first INV_CHIP_INVALID 0 value as safe
guard.

Fixes: 31c24c1e93c3 ("iio: imu: inv_icm42600: add core of new inv_icm42600 driver")
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>
Link: https://lore.kernel.org/r/20220609102301.4794-1-jmaneyrol@invensense.com
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/imu/inv_icm42600/inv_icm42600.h      |    1 +
 drivers/iio/imu/inv_icm42600/inv_icm42600_core.c |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/iio/imu/inv_icm42600/inv_icm42600.h
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600.h
@@ -17,6 +17,7 @@
 #include "inv_icm42600_buffer.h"
 
 enum inv_icm42600_chip {
+	INV_CHIP_INVALID,
 	INV_CHIP_ICM42600,
 	INV_CHIP_ICM42602,
 	INV_CHIP_ICM42605,
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
@@ -565,7 +565,7 @@ int inv_icm42600_core_probe(struct regma
 	bool open_drain;
 	int ret;
 
-	if (chip < 0 || chip >= INV_CHIP_NB) {
+	if (chip <= INV_CHIP_INVALID || chip >= INV_CHIP_NB) {
 		dev_err(dev, "invalid chip = %d\n", chip);
 		return -ENODEV;
 	}