| Message ID | 20210614103409.3154127-8-arnd@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: v4l2: compat ioctl fixes | expand |
Hi Arnd, Thank you for the patch. On Mon, Jun 14, 2021 at 12:34:08PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > 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 The compat_ioctl32 callback for subdevs has outdated calling conventions, 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@arndb.de> > --- > 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);
On 14/06/2021 19:18, Laurent Pinchart wrote: > Hi Arnd, > > Thank you for the patch. > > On Mon, Jun 14, 2021 at 12:34:08PM +0200, Arnd Bergmann wrote: >> From: Arnd Bergmann <arnd@arndb.de> >> >> 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@arndb.de> >> --- >> 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. I agree, we can drop it completely. I'll skip this patch, but I'll take the other 7 patches and make a v3 PR with updated Reviewed-by tags from Laurent. Regards, Hans > >> }; >> >> 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); >
On Tue, Jun 15, 2021 at 10:27 AM Hans Verkuil <hverkuil-cisco@xs4all.nl> wrote: > On 14/06/2021 19:18, Laurent Pinchart wrote: > > > > 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. > > I agree, we can drop it completely. I agree about new drivers defining their ioctls in a compatible way, though Ideally I'd say subdev drivers should not use custom ioctls at all. There are two other drivers that define private subdev ioctls and that lack a working compat handler: - the omap3 isp driver would not work in compat mode, though I don't think there are any 64-bit SoCs using this hardware. The Sitara AM6 and J72 SoCs are the only chips in that family at the moment, but these don't seem to include any image processor. - The Intel Atom ISP driver has a broken compat ioctl handler that I remove in this series, but the v4l2_subdev_core_ops->compat_ioctl32 callback would be the correct place to hook these up if they do not get fixed. > I'll skip this patch, but I'll take the other 7 patches and make a v3 PR with > updated Reviewed-by tags from Laurent. Thanks! Arnd
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 }; 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);