This patch resolves a dead lock issue that could be incurred when
exynos_drm_crtc_dpms function was called.
The exynos_drm_crtc_dpms function waits for the completion of pended
page flip events. However, preclose callback - this releases all unhandled
page flip events - is called prior to the exynos_drm_crtc_dpms function call
when drm is closed. So at this time, this will make the exynos_drm_crtc_dpms
to wait infiniately for the completion of the page flip events.
This patch releases the unhandled page flip events at postclose instead
of preclose so that exynos_drm_crtc_dpms function can be waked up.
Signed-off-by: Inki Dae <inki.dae@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_drv.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index f727f98..9974294 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -167,10 +167,18 @@ static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
static void exynos_drm_preclose(struct drm_device *dev,
struct drm_file *file)
{
+ exynos_drm_subdrv_close(dev, file);
+}
+
+static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
+{
struct exynos_drm_private *private = dev->dev_private;
struct drm_pending_vblank_event *e, *t;
unsigned long flags;
+ if (!file->driver_priv)
+ return;
+
/* release events of current file */
spin_lock_irqsave(&dev->event_lock, flags);
list_for_each_entry_safe(e, t, &private->pageflip_event_list,
@@ -182,13 +190,6 @@ static void exynos_drm_preclose(struct drm_device *dev,
}
spin_unlock_irqrestore(&dev->event_lock, flags);
- exynos_drm_subdrv_close(dev, file);
-}
-
-static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
-{
- if (!file->driver_priv)
- return;
kfree(file->driver_priv);
file->driver_priv = NULL;
--
1.7.9.5
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