Hi Arnd,
Thank you for the patch.
On Mon, Jun 14, 2021 at 12:34:08PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> The adv7842 and si4713 drivers each define one private ioctl command that
> are handled through the subdev_ioctl() helpers, but that don't work in
s/don't/doesn't/
> compat mode because this does not handle private ioctl commands.
>
> The compat_ioctl32 callback for subdevs has outdated calling conventions,
> but as there are no users of that, it is easy to change the function
> pointer type and the caller to make it behave the same way as the normal
> ioctl callback and hook in the two drivers that need no argument
> conversion.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/media/i2c/adv7842.c | 3 +++
> drivers/media/radio/si4713/si4713.c | 3 +++
> drivers/media/v4l2-core/v4l2-subdev.c | 19 ++++++++++++++++---
> include/media/v4l2-subdev.h | 3 +--
> 4 files changed, 23 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c
> index 78e61fe6f2f0..cd6df4f52f33 100644
> --- a/drivers/media/i2c/adv7842.c
> +++ b/drivers/media/i2c/adv7842.c
> @@ -3293,6 +3293,9 @@ static const struct v4l2_ctrl_ops adv7842_ctrl_ops = {
> static const struct v4l2_subdev_core_ops adv7842_core_ops = {
> .log_status = adv7842_log_status,
> .ioctl = adv7842_ioctl,
> +#ifdef CONFIG_COMPAT
> + .compat_ioctl32 = adv7842_ioctl,
> +#endif
> .interrupt_service_routine = adv7842_isr,
> .subscribe_event = adv7842_subscribe_event,
> .unsubscribe_event = v4l2_event_subdev_unsubscribe,
> diff --git a/drivers/media/radio/si4713/si4713.c b/drivers/media/radio/si4713/si4713.c
> index adbf43ff6a21..ae7e477774e3 100644
> --- a/drivers/media/radio/si4713/si4713.c
> +++ b/drivers/media/radio/si4713/si4713.c
> @@ -1398,6 +1398,9 @@ static const struct v4l2_ctrl_ops si4713_ctrl_ops = {
>
> static const struct v4l2_subdev_core_ops si4713_subdev_core_ops = {
> .ioctl = si4713_ioctl,
> +#ifdef CONFIG_COMPAT
> + .compat_ioctl32 = si4713_ioctl,
> +#endif
Should we drop v4l2_subdev_core_ops.compat_ioctl32 and call
v4l2_subdev_core_ops.ioctl from subdev_do_compat_ioctl32() ? New drivers
should design custom ioctls in a way that doesn't require compat code.
> };
>
> static const struct v4l2_subdev_tuner_ops si4713_subdev_tuner_ops = {
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index bf3aa9252458..fbd176d6c415 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -686,13 +686,26 @@ static long subdev_ioctl(struct file *file, unsigned int cmd,
> }
>
> #ifdef CONFIG_COMPAT
> -static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
> - unsigned long arg)
> +static long subdev_do_compat_ioctl32(struct file *file, unsigned int cmd, void *arg)
> {
> struct video_device *vdev = video_devdata(file);
> struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
> + struct mutex *lock = vdev->lock;
> + long ret = -ENODEV;
>
> - return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
> + if (lock && mutex_lock_interruptible(lock))
> + return -ERESTARTSYS;
> + if (video_is_registered(vdev))
> + ret = v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
> + if (lock)
> + mutex_unlock(lock);
> + return ret;
> +}
> +
> +static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
> + unsigned long arg)
> +{
> + return video_usercopy(file, cmd, arg, subdev_do_compat_ioctl32);
> }
> #endif
>
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index d0e9a5bdb08b..42aa1f6c7c3f 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -195,8 +195,7 @@ struct v4l2_subdev_core_ops {
> int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
> long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
> #ifdef CONFIG_COMPAT
> - long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd,
> - unsigned long arg);
> + long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
> #endif
> #ifdef CONFIG_VIDEO_ADV_DEBUG
> int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
--
Regards,
Laurent Pinchart
