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[35.245.224.76]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-45da764043esm33801921cf.88.2024.10.08.00.06.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2024 00:06:17 -0700 (PDT) From: Ricardo Ribalda Date: Tue, 08 Oct 2024 07:06:14 +0000 Subject: [PATCH 1/3] media: uvcvideo: Support partial control reads 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: <20241008-uvc-readless-v1-1-042ac4581f44@chromium.org> References: <20241008-uvc-readless-v1-0-042ac4581f44@chromium.org> In-Reply-To: <20241008-uvc-readless-v1-0-042ac4581f44@chromium.org> To: Laurent Pinchart , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda , stable@vger.kernel.org X-Mailer: b4 0.13.0 Some cameras, like the ELMO MX-P3, do not return all the bytes requested from a control if it can fit in less bytes. Eg: Returning 0xab instead of 0x00ab. usb 3-9: Failed to query (GET_DEF) UVC control 3 on unit 2: 1 (exp. 2). Extend the returned value from the camera and return it. Cc: stable@vger.kernel.org Fixes: a763b9fb58be ("media: uvcvideo: Do not return positive errors in uvc= _query_ctrl()") Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_video.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_= video.c index cd9c29532fb0..853dfb7b5f7b 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -79,11 +79,16 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8= unit, if (likely(ret =3D=3D size)) return 0; =20 + if (ret > 0 && ret < size) { + memset(data + ret, 0, size - ret); + return 0; + } + if (ret !=3D -EPIPE) { dev_err(&dev->udev->dev, "Failed to query (%s) UVC control %u on unit %u: %d (exp. %u).\n", uvc_query_name(query), cs, unit, ret, size); - return ret < 0 ? ret : -EPIPE; + return ret ? ret : -EPIPE; } =20 /* Reuse data[0] to request the error code. */ --=20 2.47.0.rc0.187.ge670bccf7e-goog