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[35.236.236.5]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-467776034b0sm11232441cf.74.2024.12.10.14.22.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Dec 2024 14:22:29 -0800 (PST) From: Ricardo Ribalda Date: Tue, 10 Dec 2024 22:22:22 +0000 Subject: [PATCH 1/3] media: uvcvideo: Return the number of processed controls 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: <20241210-uvc-data-backup-v1-1-77141e439cc3@chromium.org> References: <20241210-uvc-data-backup-v1-0-77141e439cc3@chromium.org> In-Reply-To: <20241210-uvc-data-backup-v1-0-77141e439cc3@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda , stable@kernel.org X-Mailer: b4 0.13.0 If we let know our callers that we have not done anything, they will be able to optimize their decisions. Cc: stable@kernel.org Fixes: b4012002f3a3 ("[media] uvcvideo: Add support for control events") Signed-off-by: Ricardo Ribalda Reviewed-by: Laurent Pinchart --- drivers/media/usb/uvc/uvc_ctrl.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_c= trl.c index 4fe26e82e3d1..7e2fc97c9f43 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1810,9 +1810,14 @@ int uvc_ctrl_begin(struct uvc_video_chain *chain) return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0; } =20 +/* + * Returns the number of uvc controls that have been correctly set, or a + * negative number if there has been an error. + */ static int uvc_ctrl_commit_entity(struct uvc_device *dev, struct uvc_entity *entity, int rollback, struct uvc_control **err_ctrl) { + unsigned int processed_ctrls =3D 0; struct uvc_control *ctrl; unsigned int i; int ret; @@ -1847,6 +1852,9 @@ static int uvc_ctrl_commit_entity(struct uvc_device *= dev, else ret =3D 0; =20 + if (!ret) + processed_ctrls++; + if (rollback || ret < 0) memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP), @@ -1861,7 +1869,7 @@ static int uvc_ctrl_commit_entity(struct uvc_device *= dev, } } =20 - return 0; + return processed_ctrls; } =20 static int uvc_ctrl_find_ctrl_idx(struct uvc_entity *entity, @@ -1910,7 +1918,7 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int roll= back, uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count); done: mutex_unlock(&chain->ctrl_mutex); - return ret; + return ret < 0 ? ret : 0; } =20 int uvc_ctrl_get(struct uvc_video_chain *chain, --=20 2.47.0.338.g60cca15819-goog