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[34.85.216.189]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6d40dd733c3sm38255246d6.97.2024.11.18.09.16.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Nov 2024 09:16:56 -0800 (PST) From: Ricardo Ribalda Date: Mon, 18 Nov 2024 17:16:51 +0000 Subject: [PATCH v3 1/2] media: uvcvideo: Support partial control reads Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241118-uvc-readless-v3-1-d97c1a3084d0@chromium.org> References: <20241118-uvc-readless-v3-0-d97c1a3084d0@chromium.org> In-Reply-To: <20241118-uvc-readless-v3-0-d97c1a3084d0@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda , Sakari Ailus , 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 | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index cd9c29532fb0..e165850397a0 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -76,8 +76,22 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit, ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, UVC_CTRL_CONTROL_TIMEOUT); - if (likely(ret == size)) + if (ret > 0) { + if (size == ret) + return 0; + + /* + * In UVC the data is represented in little-endian by default. + * Some devices return shorter control packages that expected + * if the return value can fit in less bytes. + * Zero all the bytes that the device have not written. + */ + memset(data + ret, 0, size - ret); + dev_warn_once(&dev->udev->dev, + "UVC non compliance: %s control %u on unit %u returned %d bytes when we expected %u.\n", + uvc_query_name(query), cs, unit, ret, size); return 0; + } if (ret != -EPIPE) { dev_err(&dev->udev->dev,