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drm: Avoid calling vblank function is vblank wasn't initialized 

In some case vblank might not be initialized and we shouldn't
try to use associated function. This patch make sure this is
the case. It also export drm_vblank_cleanup so driver can cleanup
vblank if for any reason IRQ/MSI is not working.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jerome Glisse 2010-01-07 15:39:13 +01:00 committed by Dave Airlie
parent 059d233f9c
commit e77cef9c2d
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/drm_irq.c
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@ -115,6 +115,7 @@ void drm_vblank_cleanup(struct drm_device *dev)
dev->num_crtcs = 0;
}
EXPORT_SYMBOL(drm_vblank_cleanup);
int drm_vblank_init(struct drm_device *dev, int num_crtcs)
{
@ -163,7 +164,6 @@ int drm_vblank_init(struct drm_device *dev, int num_crtcs)
}
dev->vblank_disable_allowed = 0;
return 0;
err:
@ -493,6 +493,9 @@ EXPORT_SYMBOL(drm_vblank_off);
*/
void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
{
/* vblank is not initialized (IRQ not installed ?) */
if (!dev->num_crtcs)
return;
/*
* To avoid all the problems that might happen if interrupts
* were enabled/disabled around or between these calls, we just