2022-07-17 00:44:20

by Zheyu Ma

Subject: [PATCH v2] iio: light: isl29028: Fix the warning in isl29028_remove()

The driver use the non-managed form of the register function in
isl29028_remove(). To keep the release order as mirroring the ordering
in probe, the driver should use non-managed form in probe, too.

The following log reveals it:

[ 32.374955] isl29028 0-0010: remove
[ 32.376861] general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN PTI
[ 32.377676] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[ 32.379432] RIP: 0010:kernfs_find_and_get_ns+0x28/0xe0
[ 32.385461] Call Trace:
[ 32.385807] sysfs_unmerge_group+0x59/0x110
[ 32.386110] dpm_sysfs_remove+0x58/0xc0
[ 32.386391] device_del+0x296/0xe50
[ 32.386959] cdev_device_del+0x1d/0xd0
[ 32.387231] devm_iio_device_unreg+0x27/0xb0
[ 32.387542] devres_release_group+0x319/0x3d0
[ 32.388162] i2c_device_remove+0x93/0x1f0

Fixes: 2db5054ac28d ("staging: iio: isl29028: add runtime power management support")
Signed-off-by: Zheyu Ma <[email protected]>
---
Changes in v2:
- Use the non-managed form to register the device
---
drivers/iio/light/isl29028.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/light/isl29028.c b/drivers/iio/light/isl29028.c
index 9de3262aa688..a62787f5d5e7 100644
--- a/drivers/iio/light/isl29028.c
+++ b/drivers/iio/light/isl29028.c
@@ -625,7 +625,7 @@ static int isl29028_probe(struct i2c_client *client,
ISL29028_POWER_OFF_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);

- ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
+ ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev,
"%s(): iio registration failed with error %d\n",
--
2.25.1

2022-07-19 08:58:25

by Jonathan Cameron

Subject: Re: [PATCH v2] iio: light: isl29028: Fix the warning in isl29028_remove()

On Sun, 17 Jul 2022 08:42:41 +0800
Zheyu Ma <[email protected]> wrote:

> The driver use the non-managed form of the register function in
> isl29028_remove(). To keep the release order as mirroring the ordering
> in probe, the driver should use non-managed form in probe, too.
>
> The following log reveals it:
>
> [ 32.374955] isl29028 0-0010: remove
> [ 32.376861] general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN PTI
> [ 32.377676] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
> [ 32.379432] RIP: 0010:kernfs_find_and_get_ns+0x28/0xe0
> [ 32.385461] Call Trace:
> [ 32.385807] sysfs_unmerge_group+0x59/0x110
> [ 32.386110] dpm_sysfs_remove+0x58/0xc0
> [ 32.386391] device_del+0x296/0xe50
> [ 32.386959] cdev_device_del+0x1d/0xd0
> [ 32.387231] devm_iio_device_unreg+0x27/0xb0
> [ 32.387542] devres_release_group+0x319/0x3d0
> [ 32.388162] i2c_device_remove+0x93/0x1f0
>
> Fixes: 2db5054ac28d ("staging: iio: isl29028: add runtime power management support")
> Signed-off-by: Zheyu Ma <[email protected]>
As I'm doing one last pull request before the merge window, I've applied
this to the togreg branch of iio.git and marked it for stable.

Thanks,

Jonathan

> ---
> Changes in v2:
> - Use the non-managed form to register the device
> ---
> drivers/iio/light/isl29028.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/light/isl29028.c b/drivers/iio/light/isl29028.c
> index 9de3262aa688..a62787f5d5e7 100644
> --- a/drivers/iio/light/isl29028.c
> +++ b/drivers/iio/light/isl29028.c
> @@ -625,7 +625,7 @@ static int isl29028_probe(struct i2c_client *client,
> ISL29028_POWER_OFF_DELAY_MS);
> pm_runtime_use_autosuspend(&client->dev);
>
> - ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
> + ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(&client->dev,
> "%s(): iio registration failed with error %d\n",