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iio: core: return ENODEV if ioctl is unknown 

When the ioctl() mechanism was introduced in IIO core to centralize the
registration of all ioctls in one place via commit 8dedcc3eee ("iio:
core: centralize ioctl() calls to the main chardev"), the return code was
changed from ENODEV to EINVAL, when the ioctl code isn't known.

This was done by accident.

This change reverts back to the old behavior, where if the ioctl() code
isn't known, ENODEV is returned (vs EINVAL).

This was brought into perspective by this patch:
  https://lore.kernel.org/linux-iio/20210428150815.136150-1-paul@crapouillou.net/

Fixes: 8dedcc3eee ("iio: core: centralize ioctl() calls to the main chardev")
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Tested-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2021-05-03 17:43:50 +03:00 committed by Jonathan Cameron
parent 901f84de0e
commit af0670b0bf
1 changed files with 1 additions and 2 deletions
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3
drivers/iio/industrialio-core.c
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@ -1778,7 +1778,6 @@ static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (!indio_dev->info)
goto out_unlock;
ret = -EINVAL;
list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) {
ret = h->ioctl(indio_dev, filp, cmd, arg);
if (ret != IIO_IOCTL_UNHANDLED)
@ -1786,7 +1785,7 @@ static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
}
if (ret == IIO_IOCTL_UNHANDLED)
ret = -EINVAL;
ret = -ENODEV;
out_unlock:
mutex_unlock(&indio_dev->info_exist_lock);