media: uvcvideo: Fix uvc_ctrl_fixup_xu_info() not having any effect

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>

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index e399b9f..b78aba9 100644 (file)
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2024,13 +2024,6 @@ 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 "
@@ -2253,6 +2246,13 @@ 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;
                 }
        }