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Message-ID: <CANiDSCvKfNSdUb35AibcNg0d5NerpzeOB2SVss7+-4wy27BaCg@mail.gmail.com>
Date: Thu, 28 Nov 2024 22:49:20 +0100
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Hans de Goede <hdegoede@...hat.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: uvcvideo: Remove duplicated cap/out code
On Thu, 28 Nov 2024 at 21:46, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> On Thu, Nov 28, 2024 at 09:36:06PM +0100, Ricardo Ribalda wrote:
> > On Thu, 28 Nov 2024 at 21:31, Laurent Pinchart
> > <laurent.pinchart@...asonboard.com> wrote:
> > >
> > > On Thu, Nov 28, 2024 at 10:24:42PM +0200, Laurent Pinchart wrote:
> > > > Hi Ricardo,
> > > >
> > > > Thank you for the patch.
> > > >
> > > > On Wed, Nov 27, 2024 at 07:31:29AM +0000, Ricardo Ribalda wrote:
> > > > > The *_vid_cap and *_vid_out helpers seem to be identical. Remove all the
> > > > > duplicated code.
> > > > >
> > > > > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> > > > > ---
> > > > > Unless I miss something, cap and out helpers are identical. So there is
> > > > > no need to duplicate code
> > > > > ---
> > > > > drivers/media/usb/uvc/uvc_v4l2.c | 112 ++++++++-------------------------------
> > > > > 1 file changed, 22 insertions(+), 90 deletions(-)
> > > > >
> > > > > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> > > > > index 97c5407f6603..11ccdaf0269f 100644
> > > > > --- a/drivers/media/usb/uvc/uvc_v4l2.c
> > > > > +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> > > > > @@ -361,9 +361,11 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream,
> > > > > return ret;
> > > > > }
> > > > >
> > > > > -static int uvc_v4l2_get_format(struct uvc_streaming *stream,
> > > > > - struct v4l2_format *fmt)
> > > > > +static int uvc_ioctl_g_fmt(struct file *file, void *fh,
> > > > > + struct v4l2_format *fmt)
> > > > > {
> > > > > + struct uvc_fh *handle = fh;
> > > > > + struct uvc_streaming *stream = handle->stream;
> > > > > const struct uvc_format *format;
> > > > > const struct uvc_frame *frame;
> > > > > int ret = 0;
> > > > > @@ -395,9 +397,11 @@ static int uvc_v4l2_get_format(struct uvc_streaming *stream,
> > > > > return ret;
> > > > > }
> > > > >
> > > > > -static int uvc_v4l2_set_format(struct uvc_streaming *stream,
> > > > > - struct v4l2_format *fmt)
> > > > > +static int uvc_ioctl_s_fmt(struct file *file, void *fh,
> > > > > + struct v4l2_format *fmt)
> > > > > {
> > > > > + struct uvc_fh *handle = fh;
> > > > > + struct uvc_streaming *stream = handle->stream;
> > > > > struct uvc_streaming_control probe;
> > > > > const struct uvc_format *format;
> > > > > const struct uvc_frame *frame;
> > > > > @@ -685,11 +689,13 @@ static int uvc_ioctl_querycap(struct file *file, void *fh,
> > > > > return 0;
> > > > > }
> > > > >
> > > > > -static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
> > > > > +static int uvc_ioctl_enum_fmt(struct file *file, void *fh,
> > > > > struct v4l2_fmtdesc *fmt)
> > > > > {
> > > > > - const struct uvc_format *format;
> > > > > + struct uvc_fh *handle = fh;
> > > > > + struct uvc_streaming *stream = handle->stream;
> > > > > enum v4l2_buf_type type = fmt->type;
> > > > > + const struct uvc_format *format;
> > > > > u32 index = fmt->index;
> > > > >
> > > > > if (fmt->type != stream->type || fmt->index >= stream->nformats)
> > > > > @@ -707,82 +713,8 @@ static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
> > > > > return 0;
> > > > > }
> > > > >
> > > > > -static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
> > > > > - struct v4l2_fmtdesc *fmt)
> > > > > -{
> > > > > - struct uvc_fh *handle = fh;
> > > > > - struct uvc_streaming *stream = handle->stream;
> > > > > -
> > > > > - return uvc_ioctl_enum_fmt(stream, fmt);
> > > > > -}
> > > > > -
> > > > > -static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
> > > > > - struct v4l2_fmtdesc *fmt)
> > > > > -{
> > > > > - struct uvc_fh *handle = fh;
> > > > > - struct uvc_streaming *stream = handle->stream;
> > > > > -
> > > > > - return uvc_ioctl_enum_fmt(stream, fmt);
> > > > > -}
> > > > > -
> > > > > -static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
> > > > > - struct v4l2_format *fmt)
> > > > > -{
> > > > > - struct uvc_fh *handle = fh;
> > > > > - struct uvc_streaming *stream = handle->stream;
> > > > > -
> > > > > - return uvc_v4l2_get_format(stream, fmt);
> > > > > -}
> > > > > -
> > > > > -static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
> > > > > - struct v4l2_format *fmt)
> > > > > -{
> > > > > - struct uvc_fh *handle = fh;
> > > > > - struct uvc_streaming *stream = handle->stream;
> > > > > -
> > > > > - return uvc_v4l2_get_format(stream, fmt);
> > > > > -}
> > > > > -
> > > > > -static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
> > > > > - struct v4l2_format *fmt)
> > > > > -{
> > > > > - struct uvc_fh *handle = fh;
> > > > > - struct uvc_streaming *stream = handle->stream;
> > > > > - int ret;
> > > > > -
> > > > > - ret = uvc_acquire_privileges(handle);
> > > > > - if (ret < 0)
> > > > > - return ret;
> > > >
> > > > Has this now silently disappeared ?
> > > >
> > > > > -
> > > > > - return uvc_v4l2_set_format(stream, fmt);
> > > > > -}
> > > > > -
> > > > > -static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
> > > > > - struct v4l2_format *fmt)
> > > > > -{
> > > > > - struct uvc_fh *handle = fh;
> > > > > - struct uvc_streaming *stream = handle->stream;
> > > > > - int ret;
> > > > > -
> > > > > - ret = uvc_acquire_privileges(handle);
> > > > > - if (ret < 0)
> > > > > - return ret;
> > > > > -
> > > > > - return uvc_v4l2_set_format(stream, fmt);
> > > > > -}
> > > > > -
> > > > > -static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
> > > > > - struct v4l2_format *fmt)
> > > > > -{
> > > > > - struct uvc_fh *handle = fh;
> > > > > - struct uvc_streaming *stream = handle->stream;
> > > > > - struct uvc_streaming_control probe;
> > > > > -
> > > > > - return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
> > > > > -}
> > > > > -
> > > > > -static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
> > > > > - struct v4l2_format *fmt)
> > > > > +static int uvc_ioctl_try_fmt(struct file *file, void *fh,
> > > > > + struct v4l2_format *fmt)
> > > > > {
> > > > > struct uvc_fh *handle = fh;
> > > > > struct uvc_streaming *stream = handle->stream;
> > > > > @@ -1544,14 +1476,14 @@ static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
> > > > >
> > > > > const struct v4l2_ioctl_ops uvc_ioctl_ops = {
> > > > > .vidioc_querycap = uvc_ioctl_querycap,
> > > > > - .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
> > > > > - .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
> > > > > - .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
> > > > > - .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
> > > > > - .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
> > > > > - .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
> > > > > - .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
> > > > > - .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
> > > > > + .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt,
> > > > > + .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt,
> > > > > + .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt,
> > > > > + .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt,
> > > > > + .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt,
> > > > > + .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt,
> > > > > + .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt,
> > > > > + .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt,
> > >
> > > Also, if you're removing wrapper, let's do the same for
> > > uvc_ioctl_g_parm() and uvc_ioctl_s_parm(). Furthermore, please try to
> > > preserve the order of the function definitions, sorting them as in the
> > > ioctl_ops structure.
> >
> > Do you want the reorder in a different patch to ease the review or in the same?
>
> The same is fine with me.
I tried reordering the functions and that patch will make future
stable cherry-picks a hell:
https://gitlab.freedesktop.org/linux-media/users/ribalda/-/commit/bdcc5b6a87f1046711d9d8b6ff68c3951c1a12f8
I am reordering the callbacks in uvc_ioctl_ops instead. You do not
seem to follow any particular order there, so I guess it is fine.
Please let me know otherwise
>
> > > > > .vidioc_reqbufs = uvc_ioctl_reqbufs,
> > > > > .vidioc_querybuf = uvc_ioctl_querybuf,
> > > > > .vidioc_qbuf = uvc_ioctl_qbuf,
> > > > >
> > > > > ---
> > > > > base-commit: 72ad4ff638047bbbdf3232178fea4bec1f429319
> > > > > change-id: 20241127-uvc-dup-cap-out-6a03c01e30a3
>
> --
> Regards,
>
> Laurent Pinchart
--
Ricardo Ribalda
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