From: Rob Clark <rob@xxxxxx>
Since the plane hasn't yet taken a reference, we need to hold a
reference while waiting to ensure the backing GEM bo doesn't get
freed from under us.
Signed-off-by: Rob Clark <rob@xxxxxx>
---
drivers/staging/omapdrm/omap_crtc.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/omapdrm/omap_crtc.c b/drivers/staging/omapdrm/omap_crtc.c
index dade3de..732f2ad 100644
--- a/drivers/staging/omapdrm/omap_crtc.c
+++ b/drivers/staging/omapdrm/omap_crtc.c
@@ -155,6 +155,7 @@ static void page_flip_cb(void *arg)
struct drm_crtc *crtc = arg;
struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
struct drm_framebuffer *old_fb = omap_crtc->old_fb;
+ struct drm_gem_object *bo;
omap_crtc->old_fb = NULL;
@@ -165,6 +166,9 @@ static void page_flip_cb(void *arg)
* cycle.. for now go for correctness and later figure out speed..
*/
omap_plane_on_endwin(omap_crtc->plane, vblank_cb, crtc);
+
+ bo = omap_framebuffer_bo(crtc->fb, 0);
+ drm_gem_object_unreference_unlocked(bo);
}
static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
@@ -173,6 +177,7 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
{
struct drm_device *dev = crtc->dev;
struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+ struct drm_gem_object *bo;
DBG("%d -> %d", crtc->fb ? crtc->fb->base.id : -1, fb->base.id);
@@ -185,8 +190,15 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
omap_crtc->event = event;
crtc->fb = fb;
- omap_gem_op_async(omap_framebuffer_bo(fb, 0), OMAP_GEM_READ,
- page_flip_cb, crtc);
+ /*
+ * Hold a reference temporarily until the crtc is updated
+ * and takes the reference to the bo. This avoids it
+ * getting freed from under us:
+ */
+ bo = omap_framebuffer_bo(fb, 0);
+ drm_gem_object_reference(bo);
+
+ omap_gem_op_async(bo, OMAP_GEM_READ, page_flip_cb, crtc);
return 0;
}
--
1.7.9.5
--
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