On Fri, 26 Aug 2022 17:53:52 +0530
Shreeya Patel <shreeya.patel@xxxxxxxxxxxxx> wrote:
> tsl2583 uses devm_iio_device_register() function and
> calling iio_device_unregister() in remove breaks the
> module unloading.
> Fix this by using iio_device_register() instead of
> devm_iio_device_register() function in probe.
Not sure why you are wrapping at 55 chars. I rewrapped this whilst applying.
Reworded it a little too as I was touching it anyway.
Applied to the fixes-togreg branch of iio.git.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 371894f5d1a0 ("iio: tsl2583: add runtime power management support")
I took a look at this patch and it introduces the issue I just pointed
out in replying to your v1 by dropping the
/* Make sure the chip is on */
Which was correct even with runtime pm because it covered the case of
runtime_pm being disabled. We probably need to bring that back as well,
perhaps as part of a cleanup patch taking this fully devm_
This driver has another issue for working if runtime PM isn't built into
the kernel which is that it checks the return of pm_runtime_put_autosuspend()
which calls
static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
{
return -ENOSYS;
}
I've been meaning to do an audit for drivers that have this problem for
a while, but not yet gotten to it.
An ideal IIO driver needs to work correctly whether or not CONFIG_PM is
enabled.
Jonathan
> Signed-off-by: Shreeya Patel <shreeya.patel@xxxxxxxxxxxxx>
> ---
> Changes in v2
> - Use iio_device_register() instead of devm_iio_device_register()
> - Add fixes and stable tags
>
> drivers/iio/light/tsl2583.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/light/tsl2583.c b/drivers/iio/light/tsl2583.c
> index 82662dab87c0..94d75ec687c3 100644
> --- a/drivers/iio/light/tsl2583.c
> +++ b/drivers/iio/light/tsl2583.c
> @@ -858,7 +858,7 @@ static int tsl2583_probe(struct i2c_client *clientp,
> TSL2583_POWER_OFF_DELAY_MS);
> pm_runtime_use_autosuspend(&clientp->dev);
>
> - ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
> + ret = iio_device_register(indio_dev);
> if (ret) {
> dev_err(&clientp->dev, "%s: iio registration failed\n",
> __func__);
