[PATCH v2] drm/imx: ipuv3-crtc: Return error if ipu_plane_init() fails for primary plane

[Liu Ying <Ying.Liu@freescale.com>]

For primary plane initialization failure cases, ipu_plane_init() may return
a pointer encoded by ERR_PTR(). So, we should bailout instead of using that
pointer blindly.

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
---
v1->v2:
* Trivial commit message fix.
* Rebase onto Phillip's patch[1].
  [1] http://www.spinics.net/lists/dri-devel/msg93700.html

 drivers/gpu/drm/imx/ipuv3-crtc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index 872183a..35a77e5 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -361,6 +361,10 @@ static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 		dp = IPU_DP_FLOW_SYNC_BG;
 	ipu_crtc->plane[0] = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
 					    DRM_PLANE_TYPE_PRIMARY);
+	if (IS_ERR(ipu_crtc->plane[0])) {
+		ret = PTR_ERR(ipu_crtc->plane[0]);
+		goto err_put_resources;
+	}
 
 	ret = imx_drm_add_crtc(drm, &ipu_crtc->base, &ipu_crtc->imx_crtc,
 			&ipu_crtc->plane[0]->base, &ipu_crtc_helper_funcs,
-- 
2.5.0