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[35.236.236.5]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6dccd22f2a7sm42825276d6.27.2024.12.17.13.07.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Dec 2024 13:07:03 -0800 (PST) From: Ricardo Ribalda Date: Tue, 17 Dec 2024 21:06:58 +0000 Subject: [PATCH 2/3] media: uvcvideo: Allow changing noparam on the fly Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241217-uvc-deprecate-v1-2-57d353f68f8f@chromium.org> References: <20241217-uvc-deprecate-v1-0-57d353f68f8f@chromium.org> In-Reply-To: <20241217-uvc-deprecate-v1-0-57d353f68f8f@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.13.0 Right now the parameter value is read during video_registration and cannot be changed afterwards, despite its permissions 0644, that makes the user believe that the value can be written. The parameter only affects the beviour of uvc_queue_buffer_complete(), with only one check per buffer. We can read the value directly from uvc_queue_buffer_complete() and therefore allowing changing it with sysfs on the fly. Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_driver.c | 2 +- drivers/media/usb/uvc/uvc_queue.c | 6 ++---- drivers/media/usb/uvc/uvcvideo.h | 4 +--- 3 files changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc= _driver.c index 091145743872..10812a841587 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1995,7 +1995,7 @@ int uvc_register_video_device(struct uvc_device *dev, int ret; =20 /* Initialize the video buffers queue. */ - ret =3D uvc_queue_init(queue, type, !uvc_no_drop_param); + ret =3D uvc_queue_init(queue, type); if (ret) return ret; =20 diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_= queue.c index 26ee85657fc8..ed246d8ff31a 100644 --- a/drivers/media/usb/uvc/uvc_queue.c +++ b/drivers/media/usb/uvc/uvc_queue.c @@ -208,8 +208,7 @@ static const struct vb2_ops uvc_meta_queue_qops =3D { .stop_streaming =3D uvc_stop_streaming, }; =20 -int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, - int drop_corrupted) +int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type) { int ret; =20 @@ -239,7 +238,6 @@ int uvc_queue_init(struct uvc_video_queue *queue, enum = v4l2_buf_type type, mutex_init(&queue->mutex); spin_lock_init(&queue->irqlock); INIT_LIST_HEAD(&queue->irqqueue); - queue->flags =3D drop_corrupted ? UVC_QUEUE_DROP_CORRUPTED : 0; =20 return 0; } @@ -472,7 +470,7 @@ static void uvc_queue_buffer_complete(struct kref *ref) struct vb2_buffer *vb =3D &buf->buf.vb2_buf; struct uvc_video_queue *queue =3D vb2_get_drv_priv(vb->vb2_queue); =20 - if ((queue->flags & UVC_QUEUE_DROP_CORRUPTED) && buf->error) { + if (buf->error && !uvc_no_drop_param) { uvc_queue_buffer_requeue(queue, buf); return; } diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvi= deo.h index 07f9921d83f2..ebbd8afcf136 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -316,7 +316,6 @@ struct uvc_buffer { }; =20 #define UVC_QUEUE_DISCONNECTED (1 << 0) -#define UVC_QUEUE_DROP_CORRUPTED (1 << 1) =20 struct uvc_video_queue { struct vb2_queue queue; @@ -674,8 +673,7 @@ extern struct uvc_driver uvc_driver; struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id); =20 /* Video buffers queue management. */ -int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, - int drop_corrupted); +int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type); void uvc_queue_release(struct uvc_video_queue *queue); int uvc_request_buffers(struct uvc_video_queue *queue, struct v4l2_requestbuffers *rb); --=20 2.47.1.613.gc27f4b7a9f-goog