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| author |   Lukas Wunner <lukas@wunner.de> | 2018-02-14 06:41:25 +0100 |
|---|---|---|
| committer | Lukas Wunner <lukas@wunner.de> | 2018-02-16 22:30:06 +0100 |
| commit | 25c058ccaf2ebbc3e250ec1e199e161f91fe27d4 (patch) | |
| tree | 93aa786dec9bd0d10648ea885444f78b36daceb9 /include/drm | |
| parent | workqueue: Allow retrieval of current task's work struct (diff) | |
| download | linux-dev-25c058ccaf2ebbc3e250ec1e199e161f91fe27d4.tar.xz linux-dev-25c058ccaf2ebbc3e250ec1e199e161f91fe27d4.zip | |
drm: Allow determining if current task is output poll worker
Introduce a helper to determine if the current task is an output poll
worker.
This allows us to fix a long-standing deadlock in several DRM drivers
wherein the ->runtime_suspend callback waits for the output poll worker
to finish and the worker in turn calls a ->detect callback which waits
for runtime suspend to finish. The ->detect callback is invoked from
multiple call sites and waiting for runtime suspend to finish is the
correct thing to do except if it's executing in the context of the
worker.
v2: Expand kerneldoc to specifically mention deadlock between
output poll worker and autosuspend worker as use case. (Lyude)
Cc: Dave Airlie <airlied@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://patchwork.freedesktop.org/patch/msgid/3549ce32e7f1467102e70d3e9cbf70c46bfe108e.1518593424.git.lukas@wunner.de
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_crtc_helper.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h index 76e237bd989b..6914633037a5 100644 --- a/include/drm/drm_crtc_helper.h +++ b/include/drm/drm_crtc_helper.h @@ -77,5 +77,6 @@ void drm_kms_helper_hotplug_event(struct drm_device *dev); void drm_kms_helper_poll_disable(struct drm_device *dev); void drm_kms_helper_poll_enable(struct drm_device *dev); +bool drm_kms_helper_is_poll_worker(void); #endif |