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media: uvcvideo: Prevent setting unavailable flags 

The addition of an extra operation to use the GET_INFO command
overwrites all existing flags from the uvc_ctrls table. This includes
setting all controls as supporting GET_MIN, GET_MAX, GET_RES, and
GET_DEF regardless of whether they do or not.

Move the initialisation of these control capabilities directly to the
uvc_ctrl_fill_xu_info() call where they were originally located in that
use case, and ensure that the new functionality in uvc_ctrl_get_flags()
will only set flags based on their reported capability from the GET_INFO
call.

Fixes: 859086ae36 ("media: uvcvideo: Apply flags from device to actual properties")

Cc: stable@vger.kernel.org
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Guennadi Liakhovetski <guennadi.liakhovetski@intel.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Kieran Bingham 2018-03-21 11:43:08 -04:00 committed by Mauro Carvalho Chehab
parent a00031c159
commit 0dc68cabdb
1 changed files with 9 additions and 8 deletions
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7
drivers/media/usb/uvc/uvc_ctrl.c
View File

@ -1607,9 +1607,7 @@ static int uvc_ctrl_get_flags(struct uvc_device *dev,
ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum, ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
info->selector, data, 1); info->selector, data, 1);
if (!ret) if (!ret)
info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
| UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF
| (data[0] & UVC_CONTROL_CAP_GET ?
UVC_CTRL_FLAG_GET_CUR : 0) UVC_CTRL_FLAG_GET_CUR : 0)
| (data[0] & UVC_CONTROL_CAP_SET ? | (data[0] & UVC_CONTROL_CAP_SET ?
UVC_CTRL_FLAG_SET_CUR : 0) UVC_CTRL_FLAG_SET_CUR : 0)
@ -1689,6 +1687,9 @@ static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
info->size = le16_to_cpup((__le16 *)data); info->size = le16_to_cpup((__le16 *)data);
info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX
| UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF;
ret = uvc_ctrl_get_flags(dev, ctrl, info); ret = uvc_ctrl_get_flags(dev, ctrl, info);
if (ret < 0) { if (ret < 0) {
uvc_trace(UVC_TRACE_CONTROL, uvc_trace(UVC_TRACE_CONTROL,