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| author | Lukas Wunner <lukas@wunner.de> | 2018-02-11 12:38:28 +0300 |
|---|---|---|
| committer | Lukas Wunner <lukas@wunner.de> | 2018-02-17 00:24:25 +0300 |
| commit | 27d4ee03078aba88c5e07dcc4917e8d01d046f38 (patch) | |
| tree | 31843f798ac72fce35096eff622e4e534623a477 /include/linux | |
| parent | 54f809cfbd6b4a43959039f5d33596ed3297ce16 (diff) | |
| download | linux-27d4ee03078aba88c5e07dcc4917e8d01d046f38.tar.xz | |
workqueue: Allow retrieval of current task's work struct
Introduce a helper to retrieve the current task's work struct if it is
a workqueue worker.
This allows us to fix a long-standing deadlock in several DRM drivers
wherein the ->runtime_suspend callback waits for a specific worker to
finish and that worker in turn calls a function which waits for runtime
suspend to finish. That function 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.
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://patchwork.freedesktop.org/patch/msgid/2d8f603074131eb87e588d2b803a71765bd3a2fd.1518338788.git.lukas@wunner.de
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/workqueue.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index 4a54ef96aff5..bc0cda180c8b 100644 --- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -465,6 +465,7 @@ extern bool cancel_delayed_work_sync(struct delayed_work *dwork); extern void workqueue_set_max_active(struct workqueue_struct *wq, int max_active); +extern struct work_struct *current_work(void); extern bool current_is_workqueue_rescuer(void); extern bool workqueue_congested(int cpu, struct workqueue_struct *wq); extern unsigned int work_busy(struct work_struct *work); |