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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-15 18:11:24 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-10-01 14:32:52 +0100 |
| commit | 66377efa3fd468283a092f17692e81c2344b03ed (patch) | |
| tree | 602c3b33b5c330dc20495cba33179ce7c53563ee /drivers/gpu/drm/armada | |
| parent | fecfdb2db8b5fc2e6cb731a714889de5e43c2380 (diff) | |
| download | linux-66377efa3fd468283a092f17692e81c2344b03ed.tar.gz linux-66377efa3fd468283a092f17692e81c2344b03ed.tar.bz2 linux-66377efa3fd468283a092f17692e81c2344b03ed.zip | |
drm/armada: use xchg() to atomically update dplane->old_fb
Rather than using a spinlock, use xchg() to atomically update
dplane->old_fb. This allows us to eliminate dplane->lock.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/gpu/drm/armada')
| -rw-r--r-- | drivers/gpu/drm/armada/armada_overlay.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/drivers/gpu/drm/armada/armada_overlay.c b/drivers/gpu/drm/armada/armada_overlay.c index 093c2d4f2b79..5e2dcecbf6ef 100644 --- a/drivers/gpu/drm/armada/armada_overlay.c +++ b/drivers/gpu/drm/armada/armada_overlay.c @@ -31,7 +31,6 @@ struct armada_ovl_plane_properties { struct armada_ovl_plane { struct drm_plane base; - spinlock_t lock; struct drm_framebuffer *old_fb; uint32_t src_hw; uint32_t dst_hw; @@ -76,10 +75,7 @@ static void armada_ovl_retire_fb(struct armada_ovl_plane *dplane, { struct drm_framebuffer *old_fb; - spin_lock(&dplane->lock); - old_fb = dplane->old_fb; - dplane->old_fb = fb; - spin_unlock(&dplane->lock); + old_fb = xchg(&dplane->old_fb, fb); if (old_fb) armada_drm_queue_unref_work(dplane->base.dev, old_fb); @@ -289,10 +285,7 @@ static int armada_ovl_plane_disable(struct drm_plane *plane) if (plane->fb) drm_framebuffer_unreference(plane->fb); - spin_lock_irq(&dplane->lock); - fb = dplane->old_fb; - dplane->old_fb = NULL; - spin_unlock_irq(&dplane->lock); + fb = xchg(&dplane->old_fb, NULL); if (fb) drm_framebuffer_unreference(fb); @@ -464,7 +457,6 @@ int armada_overlay_plane_create(struct drm_device *dev, unsigned long crtcs) if (!dplane) return -ENOMEM; - spin_lock_init(&dplane->lock); init_waitqueue_head(&dplane->vbl.wait); armada_drm_vbl_event_init(&dplane->vbl.update, armada_ovl_plane_vbl, dplane); |