On Sun, 17 Jul 2022 08:42:41 +0800 Zheyu Ma <zheyuma97@xxxxxxxxx> 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 <zheyuma97@xxxxxxxxx> 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",