From: Paul Cercueil <paul@crapouillou.net>
To: Alexandru Ardelean <aardelean@deviqon.com>
Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
jic23@kernel.org, lars@metafoo.de,
Linus Walleij <linus.walleij@linaro.org>,
Nuno Sa <nuno.sa@analog.com>
Subject: Re: [PATCH] iio: core: return ENODEV if ioctl is unknown
Date: Tue, 04 May 2021 10:04:24 +0100 [thread overview]
Message-ID: <CVRKSQ.S9TXIAZ9W6262@crapouillou.net> (raw)
In-Reply-To: <20210503144350.7496-1-aardelean@deviqon.com>
Le lun., mai 3 2021 at 17:43:50 +0300, Alexandru Ardelean
<aardelean@deviqon.com> a écrit :
> When the ioctl() mechanism was introduced in IIO core to centralize
> the
> registration of all ioctls in one place via commit 8dedcc3eee3ac
> ("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: 8dedcc3eee3ac ("iio: core: centralize ioctl() calls to the
> main chardev")
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Paul Cercueil <paul@crapouillou.net>
> Cc: Nuno Sa <nuno.sa@analog.com>
> Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Tested-by: Paul Cercueil <paul@crapouillou.net>
Thanks!
-Paul
> ---
> drivers/iio/industrialio-core.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/iio/industrialio-core.c
> b/drivers/iio/industrialio-core.c
> index efb4cf91c9e4..9a3a83211a90 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -1803,7 +1803,6 @@ 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)
> @@ -1811,7 +1810,7 @@ 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(&iio_dev_opaque->info_exist_lock);
> --
> 2.31.1
>
next prev parent reply other threads:[~2021-05-04 9:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-03 14:43 [PATCH] iio: core: return ENODEV if ioctl is unknown Alexandru Ardelean
2021-05-04 7:10 ` Sa, Nuno
2021-05-04 9:04 ` Paul Cercueil [this message]
2021-05-05 12:52 ` Linus Walleij
2021-05-08 15:16 ` Jonathan Cameron
2021-05-08 18:21 ` Linus Walleij
2021-05-09 10:19 ` Jonathan Cameron
2021-05-09 15:29 ` Linus Walleij
2021-05-10 6:48 ` Greg KH
2021-05-18 0:31 ` Linus Walleij
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