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Message-ID: <bb195fae-1794-4936-8874-3233a28dfe51@redhat.com>
Date: Mon, 2 Dec 2024 13:29:29 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Ricardo Ribalda <ribalda@...omium.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: uvcvideo: Remove duplicated cap/out code
Hi Ricardo,
On 29-Nov-24 8:28 PM, Ricardo Ribalda wrote:
> The *_vid_cap and *_vid_out helpers seem to be identical:
> - Remove all the cap/out duplicated code.
> - Remove s/g_parm helpers
> - Reorder uvc_ioctl_ops
>
> And now that we are at it, fix a comment for uvc_acquire_privileges()
>
> 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
> ---
> Changes in v2:
> - Add missing acquire_privileges.
> - Also remove helper for s/g_parm.
> - Reorder callbacks.
> - Link to v1: https://lore.kernel.org/r/20241127-uvc-dup-cap-out-v1-1-1bdcad2dabb0@chromium.org
> ---
> drivers/media/usb/uvc/uvc_v4l2.c | 162 +++++++++++----------------------------
> 1 file changed, 43 insertions(+), 119 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 97c5407f6603..42f0f8a89865 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -26,6 +26,8 @@
>
> #include "uvcvideo.h"
>
> +static int uvc_acquire_privileges(struct uvc_fh *handle);
> +
> static int uvc_control_add_xu_mapping(struct uvc_video_chain *chain,
> struct uvc_control_mapping *map,
> const struct uvc_xu_control_mapping *xmap)
> @@ -361,9 +363,11 @@ 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;
> @@ -395,14 +399,20 @@ 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;
> int ret;
>
> + ret = uvc_acquire_privileges(handle);
> + if (ret)
> + return ret;
> +
The original code used "if (ret < 0)" here and so does this patch in
uvc_ioctl_s_parm() below.
Please change this to "if (ret < 0)" for consistency.
Otherwise this looks good to me:
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Regards,
Hans
> if (fmt->type != stream->type)
> return -EINVAL;
>
> @@ -426,10 +436,12 @@ static int uvc_v4l2_set_format(struct uvc_streaming *stream,
> return ret;
> }
>
> -static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
> - struct v4l2_streamparm *parm)
> +static int uvc_ioctl_g_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *parm)
> {
> u32 numerator, denominator;
> + struct uvc_fh *handle = fh;
> + struct uvc_streaming *stream = handle->stream;
>
> if (parm->type != stream->type)
> return -EINVAL;
> @@ -461,9 +473,11 @@ static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
> return 0;
> }
>
> -static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
> - struct v4l2_streamparm *parm)
> +static int uvc_ioctl_s_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *parm)
> {
> + struct uvc_fh *handle = fh;
> + struct uvc_streaming *stream = handle->stream;
> struct uvc_streaming_control probe;
> struct v4l2_fract timeperframe;
> const struct uvc_format *format;
> @@ -472,6 +486,10 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
> unsigned int i;
> int ret;
>
> + ret = uvc_acquire_privileges(handle);
> + if (ret < 0)
> + return ret;
> +
> if (parm->type != stream->type)
> return -EINVAL;
>
> @@ -573,6 +591,7 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
> * - VIDIOC_S_INPUT
> * - VIDIOC_S_PARM
> * - VIDIOC_S_FMT
> + * - VIDIOC_CREATE_BUFS
> * - VIDIOC_REQBUFS
> */
> static int uvc_acquire_privileges(struct uvc_fh *handle)
> @@ -685,11 +704,13 @@ 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 +728,8 @@ 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;
> -
> - 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;
> @@ -1212,29 +1159,6 @@ static int uvc_ioctl_g_selection(struct file *file, void *fh,
> return 0;
> }
>
> -static int uvc_ioctl_g_parm(struct file *file, void *fh,
> - struct v4l2_streamparm *parm)
> -{
> - struct uvc_fh *handle = fh;
> - struct uvc_streaming *stream = handle->stream;
> -
> - return uvc_v4l2_get_streamparm(stream, parm);
> -}
> -
> -static int uvc_ioctl_s_parm(struct file *file, void *fh,
> - struct v4l2_streamparm *parm)
> -{
> - 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_streamparm(stream, parm);
> -}
> -
> static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
> struct v4l2_frmsizeenum *fsize)
> {
> @@ -1543,15 +1467,17 @@ static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
> #endif
>
> const struct v4l2_ioctl_ops uvc_ioctl_ops = {
> + .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_g_parm = uvc_ioctl_g_parm,
> + .vidioc_s_parm = uvc_ioctl_s_parm,
> .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_try_fmt_vid_cap = uvc_ioctl_try_fmt,
> + .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt,
> .vidioc_reqbufs = uvc_ioctl_reqbufs,
> .vidioc_querybuf = uvc_ioctl_querybuf,
> .vidioc_qbuf = uvc_ioctl_qbuf,
> @@ -1570,8 +1496,6 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
> .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
> .vidioc_querymenu = uvc_ioctl_querymenu,
> .vidioc_g_selection = uvc_ioctl_g_selection,
> - .vidioc_g_parm = uvc_ioctl_g_parm,
> - .vidioc_s_parm = uvc_ioctl_s_parm,
> .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
> .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
> .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
>
> ---
> base-commit: 72ad4ff638047bbbdf3232178fea4bec1f429319
> change-id: 20241127-uvc-dup-cap-out-6a03c01e30a3
>
> Best regards,
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