Patch "workqueue: Allow retrieval of current task's work struct" has been added to the 4.4-stable tree

Patch "workqueue: Allow retrieval of current task's work struct" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    workqueue: Allow retrieval of current task's work struct

to the 4.4-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:
     workqueue-allow-retrieval-of-current-task-s-work-struct.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 27d4ee03078aba88c5e07dcc4917e8d01d046f38 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@wunner.de>
Date: Sun, 11 Feb 2018 10:38:28 +0100
Subject: workqueue: Allow retrieval of current task's work struct

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/2d8f603074131eb87e588d2b803a71765bd3a2fd.1518338788.git.lukas@wunner.de
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


Patches currently in stable-queue which might be from lukas@wunner.de are

queue-4.4/workqueue-allow-retrieval-of-current-task-s-work-struct.patch
queue-4.4/drm-radeon-fix-deadlock-on-runtime-suspend.patch
queue-4.4/drm-amdgpu-fix-deadlock-on-runtime-suspend.patch
queue-4.4/drm-allow-determining-if-current-task-is-output-poll-worker.patch
queue-4.4/drm-nouveau-fix-deadlock-on-runtime-suspend.patch