Some cameras do not return all the bytes requested from a control if it can fit in less bytes. Eg: returning 0xab instead of 0x00ab. Support these devices. Also, now that we are at it, improve uvc_query_ctrl() logging. Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> --- Changes in v4: - Improve comment. - Keep old likely(ret == size) - Link to v3: https://lore.kernel.org/r/20241118-uvc-readless-v3-0-d97c1a3084d0@xxxxxxxxxxxx Changes in v3: - Improve documentation. - Do not change return sequence. - Use dev_ratelimit and dev_warn_once - Link to v2: https://lore.kernel.org/r/20241008-uvc-readless-v2-0-04d9d51aee56@xxxxxxxxxxxx Changes in v2: - Rewrite error handling (Thanks Sakari) - Discard 2/3. It is not needed after rewriting the error handling. - Link to v1: https://lore.kernel.org/r/20241008-uvc-readless-v1-0-042ac4581f44@xxxxxxxxxxxx --- Ricardo Ribalda (2): media: uvcvideo: Support partial control reads media: uvcvideo: Add more logging to uvc_query_ctrl() drivers/media/usb/uvc/uvc_video.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) --- base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc change-id: 20241008-uvc-readless-23f9b8cad0b3 Best regards, -- Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
