This is a note to let you know that I've just added the patch titled
drm/probe-helper: Cancel previous job before starting new one
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-probe-helper-cancel-previous-job-before-starting.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a6decf2ef1a9f4fe277af20d026d7e38a158ff83
Author: Dom Cobley <popcornmix@xxxxxxxxx>
Date: Fri Jan 27 16:40:52 2023 +0100
drm/probe-helper: Cancel previous job before starting new one
[ Upstream commit a8e47884f1906cd7440fafa056adc8817568e73e ]
Currently we schedule a call to output_poll_execute from
drm_kms_helper_poll_enable for 10s in future. Later we try to replace
that in drm_helper_probe_single_connector_modes with a 0s schedule with
delayed_event set.
But as there is already a job in the queue this fails, and the immediate
job we wanted with delayed_event set doesn't occur until 10s later.
And that call acts as if connector state has changed, reprobing modes.
This has a side effect of waking up a display that has been blanked.
Make sure we cancel the old job before submitting the immediate one.
Fixes: 162b6a57ac50 ("drm/probe-helper: don't lose hotplug event")
Acked-by: Daniel Vetter <daniel@xxxxxxxx>
Signed-off-by: Dom Cobley <popcornmix@xxxxxxxxx>
[Maxime: Switched to mod_delayed_work]
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230127154052.452524-1-maxime@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index adbabf16c07b2..f76eced3ff94f 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -465,8 +465,9 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
*/
dev->mode_config.delayed_event = true;
if (dev->mode_config.poll_enabled)
- schedule_delayed_work(&dev->mode_config.output_poll_work,
- 0);
+ mod_delayed_work(system_wq,
+ &dev->mode_config.output_poll_work,
+ 0);
}
/* Re-enable polling in case the global poll config changed. */
