4.4-stable review patch. If anyone has any objections, please let me know.
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From: Lukas Wunner lukas@wunner.de
commit 27d4ee03078aba88c5e07dcc4917e8d01d046f38 upstream.
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/2d8f603074131eb87e588d2b803a71... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/linux/workqueue.h | 1 + kernel/workqueue.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+)
--- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -451,6 +451,7 @@ extern bool cancel_delayed_work_sync(str
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); --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -4048,6 +4048,22 @@ void workqueue_set_max_active(struct wor EXPORT_SYMBOL_GPL(workqueue_set_max_active);
/** + * current_work - retrieve %current task's work struct + * + * Determine if %current task is a workqueue worker and what it's working on. + * Useful to find out the context that the %current task is running in. + * + * Return: work struct if %current task is a workqueue worker, %NULL otherwise. + */ +struct work_struct *current_work(void) +{ + struct worker *worker = current_wq_worker(); + + return worker ? worker->current_work : NULL; +} +EXPORT_SYMBOL(current_work); + +/** * current_is_workqueue_rescuer - is %current workqueue rescuer? * * Determine whether %current is a workqueue rescuer. Can be used from