6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Zimmermann tzimmermann@suse.de
commit ff9cb6d2035c586ea7c8f1754d4409eec7a2d26d upstream.
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+ Reviewed-by: Patrik Jakobsson patrik.r.jakobsson@gmail.com Link: https://patchwork.freedesktop.org/patch/msgid/20250303145604.62962-2-tzimmer... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/udl/udl_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/udl/udl_drv.c +++ b/drivers/gpu/drm/udl/udl_drv.c @@ -126,9 +126,9 @@ static void udl_usb_disconnect(struct us { 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); }
/*