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

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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