From: Hans de Goede hdegoede@redhat.com
stable inclusion from linux-4.19.155 commit 0a77d44cc1bc55550bc714a60c7b0c9d7ebe0b7b
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commit 93df48d37c3f03886d84831992926333e7810640 upstream.
uvc_ctrl_add_info() calls uvc_ctrl_get_flags() which will override the fixed-up flags set by uvc_ctrl_fixup_xu_info().
uvc_ctrl_init_xu_ctrl() already calls uvc_ctrl_get_flags() before calling uvc_ctrl_add_info(), so the uvc_ctrl_get_flags() call in uvc_ctrl_add_info() is not necessary for xu ctrls.
This commit moves the uvc_ctrl_get_flags() call for normal controls from uvc_ctrl_add_info() to uvc_ctrl_init_ctrl(), so that we no longer call uvc_ctrl_get_flags() twice for xu controls and so that we no longer override the fixed-up flags set by uvc_ctrl_fixup_xu_info().
This fixes the xu motor controls not working properly on a Logitech 046d:08cc, and presumably also on the other Logitech models which have a quirk for this in the uvc_ctrl_fixup_xu_info() function.
Cc: stable@vger.kernel.org Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/media/usb/uvc/uvc_ctrl.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 843dc19bada0..cb6046481aed 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -2038,13 +2038,6 @@ static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl, goto done; }
- /* - * Retrieve control flags from the device. Ignore errors and work with - * default flag values from the uvc_ctrl array when the device doesn't - * properly implement GET_INFO on standard controls. - */ - uvc_ctrl_get_flags(dev, ctrl, &ctrl->info); - ctrl->initialized = 1;
uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s " @@ -2267,6 +2260,13 @@ static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl) if (uvc_entity_match_guid(ctrl->entity, info->entity) && ctrl->index == info->index) { uvc_ctrl_add_info(dev, ctrl, info); + /* + * Retrieve control flags from the device. Ignore errors + * and work with default flag values from the uvc_ctrl + * array when the device doesn't properly implement + * GET_INFO on standard controls. + */ + uvc_ctrl_get_flags(dev, ctrl, &ctrl->info); break; } }