This is a note to let you know that I've just added the patch titled
iio: magnetometer: ak8975: Fix the error handling in
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 3a26787dacf04257a68b16315c984eb2c340bc5e Mon Sep 17 00:00:00 2001 From: Zheyu Ma zheyuma97@gmail.com Date: Sat, 9 Apr 2022 11:48:49 +0800 Subject: iio: magnetometer: ak8975: Fix the error handling in ak8975_power_on()
When the driver fails to enable the regulator 'vid', we will get the following splat:
[ 79.955610] WARNING: CPU: 5 PID: 441 at drivers/regulator/core.c:2257 _regulator_put+0x3ec/0x4e0 [ 79.959641] RIP: 0010:_regulator_put+0x3ec/0x4e0 [ 79.967570] Call Trace: [ 79.967773] <TASK> [ 79.967951] regulator_put+0x1f/0x30 [ 79.968254] devres_release_group+0x319/0x3d0 [ 79.968608] i2c_device_probe+0x766/0x940
Fix this by disabling the 'vdd' regulator when failing to enable 'vid' regulator.
Signed-off-by: Zheyu Ma zheyuma97@gmail.com Link: https://lore.kernel.org/r/20220409034849.3717231-2-zheyuma97@gmail.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/magnetometer/ak8975.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index 088f748b683e..2432e697150c 100644 --- a/drivers/iio/magnetometer/ak8975.c +++ b/drivers/iio/magnetometer/ak8975.c @@ -416,6 +416,7 @@ static int ak8975_power_on(const struct ak8975_data *data) if (ret) { dev_warn(&data->client->dev, "Failed to enable specified Vid supply\n"); + regulator_disable(data->vdd); return ret; }