[PATCH v8 3/8] drm/managed: Add DRM-managed alloc_ordered_workqueue

[Louis Chauvet <louis.chauvet@bootlin.com>]

Add drmm_alloc_ordered_workqueue(), a helper that provides managed ordered
workqueue cleanup. The workqueue will be destroyed with the final
reference of the DRM device.

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>

---

Hi Thomas,

I noted that you wanted to mark this as Reviewed, but as this was not
the complete patch, I prefered to have a confirmation before merging the
patch.

Thanks for your time,
Louis Chauvet
---
 drivers/gpu/drm/drm_managed.c |  8 ++++++++
 include/drm/drm_managed.h     | 12 ++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
index 79ce86a5bd67a7201f5d60550a12364f2628e0ec..1589c28410f23b5a1e93dd1638420b3ae5c4b854 100644
--- a/drivers/gpu/drm/drm_managed.c
+++ b/drivers/gpu/drm/drm_managed.c
@@ -310,3 +310,11 @@ void __drmm_mutex_release(struct drm_device *dev, void *res)
 	mutex_destroy(lock);
 }
 EXPORT_SYMBOL(__drmm_mutex_release);
+
+void __drmm_destroy_workqueue(struct drm_device *device, void *res)
+{
+	struct workqueue_struct *wq = res;
+
+	destroy_workqueue(wq);
+}
+EXPORT_SYMBOL(__drmm_destroy_workqueue);
diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
index f547b09ca0239dd7c4fb734038bae4438321395c..96d9b0e811675fe66d5d48f02b17bc7de2ac437e 100644
--- a/include/drm/drm_managed.h
+++ b/include/drm/drm_managed.h
@@ -127,4 +127,16 @@ void __drmm_mutex_release(struct drm_device *dev, void *res);
 	drmm_add_action_or_reset(dev, __drmm_mutex_release, lock);	     \
 })									     \
 
+void __drmm_destroy_workqueue(struct drm_device *device, void *wq);
+
+#define drmm_alloc_ordered_workqueue(dev, fmt, flags, args...)					\
+	({											\
+		struct workqueue_struct *wq = alloc_ordered_workqueue(fmt, flags, ##args);	\
+		wq ? ({										\
+			int ret = drmm_add_action_or_reset(dev, __drmm_destroy_workqueue, wq);	\
+			ret ? ERR_PTR(ret) : wq;						\
+		}) :										\
+			wq;									\
+	})
+
 #endif

-- 
2.47.1