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drm/omap: keep ref to old_fb 

We store the fb being page-flipped to 'old_fb' field, but we don't
increase the ref count of the fb when doing that. While I am not
sure if it can cause problem in practice, it's still safer to keep a ref
when storing a pointer to a fb.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2015-02-10 14:15:52 +02:00
parent 7439507f01
commit 223bfd6911
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/omapdrm/omap_crtc.c
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@ -554,6 +554,7 @@ static void vblank_cb(void *arg)
struct drm_device *dev = crtc->dev;
struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
unsigned long flags;
struct drm_framebuffer *fb;
spin_lock_irqsave(&dev->event_lock, flags);
@ -561,10 +562,15 @@ static void vblank_cb(void *arg)
if (omap_crtc->event)
drm_send_vblank_event(dev, omap_crtc->pipe, omap_crtc->event);
fb = omap_crtc->old_fb;
omap_crtc->event = NULL;
omap_crtc->old_fb = NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
if (fb)
drm_framebuffer_unreference(fb);
}
static void page_flip_worker(struct work_struct *work)
@ -620,6 +626,7 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
omap_crtc->event = event;
omap_crtc->old_fb = primary->fb = fb;
drm_framebuffer_reference(omap_crtc->old_fb);
spin_unlock_irqrestore(&dev->event_lock, flags);