diff options
| author | Imre Deak <imre.deak@intel.com> | 2012-11-02 13:30:49 +0200 |
|---|---|---|
| committer | Inki Dae <daeinki@gmail.com> | 2012-11-29 03:30:34 -0800 |
| commit | 9fb7dff5ec238c8f71ef9b06256957a0db585c04 (patch) | |
| tree | 20ea8f26cc5b8eafb90a70d4b47cd13d2d647e19 /drivers/gpu/drm/exynos/exynos_drm_vidi.c | |
| parent | e1f48ee58a90ddf84f514334b5d395a358596492 (diff) | |
| download | linux-9fb7dff5ec238c8f71ef9b06256957a0db585c04.tar.bz2 | |
drm/exynos: fix lockdep for event_lock wrt. vbl_time_lock
Currently the exynos driver calls drm_vblank_off() with the event_lock
held, while drm_vblank_off() will lock vbl_time and vblank_time_lock.
This lock dependency chain conflicts with the one in drm_handle_vblank()
where we first lock vblank_time_lock and then the event_lock.
Fix this by removing the above drm_vblank_off() calls which are in fact
never executed: drm_dev->vblank_disable_allowed is only ever non-zero
during driver init, until it's set in {fimd,vidi}_subdrv_probe. Both the
driver init and open code is protected by drm_global_mutex, so the
earliest page flip ioctl can happen only after vblank_disable_allowed is
set to 1. Thus {fimd,vidi}_finish_pageflip - with pending flip events -
will always get called with vblank_disable_allowed being 1.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Diffstat (limited to 'drivers/gpu/drm/exynos/exynos_drm_vidi.c')
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_vidi.c | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c index e26d45577551..4b0c16bfd1da 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c @@ -382,7 +382,6 @@ static void vidi_finish_pageflip(struct drm_device *drm_dev, int crtc) struct drm_pending_vblank_event *e, *t; struct timeval now; unsigned long flags; - bool is_checked = false; spin_lock_irqsave(&drm_dev->event_lock, flags); @@ -392,8 +391,6 @@ static void vidi_finish_pageflip(struct drm_device *drm_dev, int crtc) if (crtc != e->pipe) continue; - is_checked = true; - do_gettimeofday(&now); e->event.sequence = 0; e->event.tv_sec = now.tv_sec; @@ -404,15 +401,6 @@ static void vidi_finish_pageflip(struct drm_device *drm_dev, int crtc) drm_vblank_put(drm_dev, crtc); } - if (is_checked) { - /* - * don't off vblank if vblank_disable_allowed is 1, - * because vblank would be off by timer handler. - */ - if (!drm_dev->vblank_disable_allowed) - drm_vblank_off(drm_dev, crtc); - } - spin_unlock_irqrestore(&drm_dev->event_lock, flags); } |