Disconnecting a DisplayLink device results in the following kernel error messages

[ 93.041748] [drm:udl_urb_completion [udl]] *ERROR* udl_urb_completion - nonzero write bulk status received: -115 [ 93.055299] [drm:udl_submit_urb [udl]] *ERROR* usb_submit_urb error fffffffe [ 93.065363] [drm:udl_urb_completion [udl]] *ERROR* udl_urb_completion - nonzero write bulk status received: -115 [ 93.078207] [drm:udl_submit_urb [udl]] *ERROR* usb_submit_urb error fffffffe

coming from KMS poll helpers. Shutting down poll helpers runs them one final time when the USB device is already gone.

Run drm_dev_unplug() first in udl's USB disconnect handler. Udl's polling code already handles disconnects gracefully if the device has been marked as unplugged.

Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Fixes: b1a981bd5576 ("drm/udl: drop drm_driver.release hook") Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v5.8+ --- drivers/gpu/drm/udl/udl_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c index 05b3a152cc33..7e7d704be0c0 100644 --- a/drivers/gpu/drm/udl/udl_drv.c +++ b/drivers/gpu/drm/udl/udl_drv.c @@ -127,9 +127,9 @@ static void udl_usb_disconnect(struct usb_interface *interface) { struct drm_device *dev = usb_get_intfdata(interface);

+ drm_dev_unplug(dev); drm_kms_helper_poll_fini(dev); udl_drop_usb(dev); - drm_dev_unplug(dev); }

/*