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drm/vc4: Fix race between page flip completion event and clean-up

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There was a small window where a userspace program could submit
a pageflip after receiving a pageflip completion event yet still
receive EBUSY.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Derek Foreman
2016-11-24 12:11:55 -06:00
committed by Eric Anholt
parent c778cc5df9
commit 26fc78f6fe
3 changed files with 34 additions and 8 deletions
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8
drivers/gpu/drm/vc4/vc4_crtc.c
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@@ -669,6 +669,14 @@ void vc4_disable_vblank(struct drm_device *dev, unsigned int crtc_id)
CRTC_WRITE(PV_INTEN, 0);
}
/* Must be called with the event lock held */
bool vc4_event_pending(struct drm_crtc *crtc)
{
struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
return !!vc4_crtc->event;
}
static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
{
struct drm_crtc *crtc = &vc4_crtc->base;