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Date: Thu, 18 Mar 2021 08:49:16 +0100
From: Ricardo Ribalda <ribalda@...omium.org>
To: Hans Verkuil <hverkuil-cisco@...all.nl>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Linux Media Mailing List <linux-media@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Tomasz Figa <tfiga@...omium.org>, stable@...r.kernel.org
Subject: Re: [PATCH v6 01/17] media: v4l2-ioctl: check_ext_ctrls: Fix
multiclass V4L2_CTRL_WHICH_DEF_VAL
Hi Hans
On Thu, Mar 18, 2021 at 8:48 AM Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
>
> On 18/03/2021 08:17, Ricardo Ribalda wrote:
> > Hi Hans
> >
> > Can I merge 1-3, but leave 4 as a separate one? It helps to tell a
> > story for 5 and 6.
>
> I really prefer it as a single patch. All four patches are basically a single big fix
> for v4l2-ioctl.c where the code for drivers that do not use the control framework had
> become very outdated. Fixing it in a single patch helps backporting to stable, and
> it is easier to review and see everything that had to be done to fix this.
>
> In this case I wondered when I was reviewing patch 1 why V4L2_CTRL_WHICH_DEF_VAL was
> just accepted without checking for S/TRY_EXT_CTRLS. Basically patch 1 is a broken fix
> w.r.t. DEF_VAL until patch 4, which really fixes it.
>
> Just do it all in a single patch, splitting it up doesn't work in this particular case.
Ok, thanks for the clarification :)
>
> Regards,
>
> Hans
>
> >
> > Thanks
> >
> > On Thu, Mar 18, 2021 at 8:14 AM Hans Verkuil <hverkuil-cisco@...all.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@...all.nl>
> >>
> >> after these 4 patches are merged. It looks much nicer now.
> >>
> >> Regards,
> >>
> >> Hans
> >>
> >>>
> >>> Cc: stable@...r.kernel.org
> >>> Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
> >>> Suggested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
> >>> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> >>> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.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
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