Re: [PATCH v6 01/17] media: v4l2-ioctl: check_ext_ctrls: Fix multiclass V4L2_CTRL_WHICH_DEF_VAL

[Ricardo Ribalda <ribalda@chromium.org>]

Hi Hans

Can I merge 1-3, but leave 4 as a separate one? It helps to tell a
story for 5 and  6.

Thanks

On Thu, Mar 18, 2021 at 8:14 AM Hans Verkuil <hverkuil-cisco@xs4all.nl> wrote:
>
> Hi Ricardo,
>
> On 17/03/2021 17:44, Ricardo Ribalda wrote:
> > Drivers that do not use the ctrl-framework use this function instead.
> >
> > - Do not check for multiple classes when getting the DEF_VAL.
> >
> > Fixes v4l2-compliance:
> > Control ioctls (Input 0):
> >               fail: v4l2-test-controls.cpp(813): doioctl(node, VIDIOC_G_EXT_CTRLS, &ctrls)
> >       test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL
>
> Can you merge patches 1-4 into a single patch? It's really one big fix since
> this code was never updated when new 'which' values were added. So keeping it
> together is, for once, actually preferred.
>
> You can add my:
>
> Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
>
> after these 4 patches are merged. It looks much nicer now.
>
> Regards,
>
>         Hans
>
> >
> > Cc: stable@vger.kernel.org
> > Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
> > Suggested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > ---
> >  drivers/media/v4l2-core/v4l2-ioctl.c | 47 ++++++++++++++++------------
> >  1 file changed, 27 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> > index 31d1342e61e8..403f957a1012 100644
> > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> > @@ -908,7 +908,7 @@ static void v4l_print_default(const void *arg, bool write_only)
> >       pr_cont("driver-specific ioctl\n");
> >  }
> >
> > -static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
> > +static bool check_ext_ctrls(struct v4l2_ext_controls *c, unsigned long ioctl)
> >  {
> >       __u32 i;
> >
> > @@ -917,23 +917,30 @@ static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
> >       for (i = 0; i < c->count; i++)
> >               c->controls[i].reserved2[0] = 0;
> >
> > -     /* V4L2_CID_PRIVATE_BASE cannot be used as control class
> > -        when using extended controls.
> > -        Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
> > -        is it allowed for backwards compatibility.
> > -      */
> > -     if (!allow_priv && c->which == V4L2_CID_PRIVATE_BASE)
> > -             return 0;
> > -     if (!c->which)
> > -             return 1;
> > +     switch (c->which) {
> > +     case V4L2_CID_PRIVATE_BASE:
> > +             /*
> > +              * V4L2_CID_PRIVATE_BASE cannot be used as control class
> > +              * when using extended controls.
> > +              * Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
> > +              * is it allowed for backwards compatibility.
> > +              */
> > +             if (ioctl == VIDIOC_G_CTRL || ioctl == VIDIOC_S_CROP)
> > +                     return false;
> > +             break;
> > +     case V4L2_CTRL_WHICH_DEF_VAL:
> > +     case V4L2_CTRL_WHICH_CUR_VAL:
> > +             return true;
> > +     }
> > +
> >       /* Check that all controls are from the same control class. */
> >       for (i = 0; i < c->count; i++) {
> >               if (V4L2_CTRL_ID2WHICH(c->controls[i].id) != c->which) {
> >                       c->error_idx = i;
> > -                     return 0;
> > +                     return false;
> >               }
> >       }
> > -     return 1;
> > +     return true;
> >  }
> >
> >  static int check_fmt(struct file *file, enum v4l2_buf_type type)
> > @@ -2229,7 +2236,7 @@ static int v4l_g_ctrl(const struct v4l2_ioctl_ops *ops,
> >       ctrls.controls = &ctrl;
> >       ctrl.id = p->id;
> >       ctrl.value = p->value;
> > -     if (check_ext_ctrls(&ctrls, 1)) {
> > +     if (check_ext_ctrls(&ctrls, VIDIOC_G_CTRL)) {
> >               int ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
> >
> >               if (ret == 0)
> > @@ -2263,7 +2270,7 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
> >       ctrls.controls = &ctrl;
> >       ctrl.id = p->id;
> >       ctrl.value = p->value;
> > -     if (check_ext_ctrls(&ctrls, 1))
> > +     if (check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
> >               return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
> >       return -EINVAL;
> >  }
> > @@ -2285,8 +2292,8 @@ static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> >                                       vfd, vfd->v4l2_dev->mdev, p);
> >       if (ops->vidioc_g_ext_ctrls == NULL)
> >               return -ENOTTY;
> > -     return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
> > -                                     -EINVAL;
> > +     return check_ext_ctrls(p, VIDIOC_G_EXT_CTRLS) ?
> > +                             ops->vidioc_g_ext_ctrls(file, fh, p) : -EINVAL;
> >  }
> >
> >  static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> > @@ -2306,8 +2313,8 @@ static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> >                                       vfd, vfd->v4l2_dev->mdev, p);
> >       if (ops->vidioc_s_ext_ctrls == NULL)
> >               return -ENOTTY;
> > -     return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
> > -                                     -EINVAL;
> > +     return check_ext_ctrls(p, VIDIOC_S_EXT_CTRLS) ?
> > +                             ops->vidioc_s_ext_ctrls(file, fh, p) : -EINVAL;
> >  }
> >
> >  static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> > @@ -2327,8 +2334,8 @@ static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> >                                         vfd, vfd->v4l2_dev->mdev, p);
> >       if (ops->vidioc_try_ext_ctrls == NULL)
> >               return -ENOTTY;
> > -     return check_ext_ctrls(p, 0) ? ops->vidioc_try_ext_ctrls(file, fh, p) :
> > -                                     -EINVAL;
> > +     return check_ext_ctrls(p, VIDIOC_TRY_EXT_CTRLS) ?
> > +                     ops->vidioc_try_ext_ctrls(file, fh, p) : -EINVAL;
> >  }
> >
> >  /*
> >
>


-- 
Ricardo Ribalda