Commit 38e5597a authored by Archit Taneja's avatar Archit Taneja Committed by Tomi Valkeinen

drm/omap: protect omap_crtc's event with event_lock spinlock

The vblank_cb callback and the page_flip ioctl can occur together in different
CPU contexts. vblank_cb uses takes tje drm device's event_lock spinlock when
sending the vblank event and updating omap_crtc->event and omap_crtc->od_fb.

Use the same spinlock in page_flip, to make sure the above omap_crtc parameters
are configured sequentially.
Signed-off-by: default avatarArchit Taneja <archit@ti.com>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent bc905ace
...@@ -350,11 +350,15 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc, ...@@ -350,11 +350,15 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
struct omap_crtc *omap_crtc = to_omap_crtc(crtc); struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
struct drm_plane *primary = crtc->primary; struct drm_plane *primary = crtc->primary;
struct drm_gem_object *bo; struct drm_gem_object *bo;
unsigned long flags;
DBG("%d -> %d (event=%p)", primary->fb ? primary->fb->base.id : -1, DBG("%d -> %d (event=%p)", primary->fb ? primary->fb->base.id : -1,
fb->base.id, event); fb->base.id, event);
spin_lock_irqsave(&dev->event_lock, flags);
if (omap_crtc->old_fb) { if (omap_crtc->old_fb) {
spin_unlock_irqrestore(&dev->event_lock, flags);
dev_err(dev->dev, "already a pending flip\n"); dev_err(dev->dev, "already a pending flip\n");
return -EINVAL; return -EINVAL;
} }
...@@ -362,6 +366,8 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc, ...@@ -362,6 +366,8 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
omap_crtc->event = event; omap_crtc->event = event;
omap_crtc->old_fb = primary->fb = fb; omap_crtc->old_fb = primary->fb = fb;
spin_unlock_irqrestore(&dev->event_lock, flags);
/* /*
* Hold a reference temporarily until the crtc is updated * Hold a reference temporarily until the crtc is updated
* and takes the reference to the bo. This avoids it * and takes the reference to the bo. This avoids it
......
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