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drm: Use correct spinlock flavor in drm_vblank_get() 

The irq flags state is already established by the outer
spin_lock_irqsave(); re-disabling irqs is redundant.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Peter Hurley 2013-08-20 21:51:12 -04:00 committed by Daniel Vetter
parent 263432b021
commit 97cbc883d0
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/drm_irq.c
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@ -848,13 +848,13 @@ static void drm_update_vblank_count(struct drm_device *dev, int crtc)
*/
int drm_vblank_get(struct drm_device *dev, int crtc)
{
unsigned long irqflags, irqflags2;
unsigned long irqflags;
int ret = 0;
spin_lock_irqsave(&dev->vbl_lock, irqflags);
/* Going from 0->1 means we have to enable interrupts again */
if (atomic_add_return(1, &dev->vblank[crtc].refcount) == 1) {
spin_lock_irqsave(&dev->vblank_time_lock, irqflags2);
spin_lock(&dev->vblank_time_lock);
if (!dev->vblank[crtc].enabled) {
/* Enable vblank irqs under vblank_time_lock protection.
* All vblank count & timestamp updates are held off
@ -872,7 +872,7 @@ int drm_vblank_get(struct drm_device *dev, int crtc)
drm_update_vblank_count(dev, crtc);
}
}
spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2);
spin_unlock(&dev->vblank_time_lock);
} else {
if (!dev->vblank[crtc].enabled) {
atomic_dec(&dev->vblank[crtc].refcount);