drm: shmob_drm: Check clk_prepare_enable() return value

The clk_prepare_enable() call can fail. Check it's return value. We
can't propagate it all the way to the user as the KMS operations in
which the clock is enabled return a void.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 14 insertions, 4 deletions

diff --git a/drivers/gpu/drm/shmobile/shmob_drm_crtc.c b/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
index 562f9a401cf6..0428076f1ce8 100644
--- a/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
+++ b/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
@@ -37,14 +37,21 @@
  * Clock management
  */
 
-static void shmob_drm_clk_on(struct shmob_drm_device *sdev)
+static int shmob_drm_clk_on(struct shmob_drm_device *sdev)
 {
-        if (sdev->clock)
-                clk_prepare_enable(sdev->clock);
+        int ret;
+
+        if (sdev->clock) {
+                ret = clk_prepare_enable(sdev->clock);
+                if (ret < 0)
+                        return ret;
+        }
 #if 0
         if (sdev->meram_dev && sdev->meram_dev->pdev)
                 pm_runtime_get_sync(&sdev->meram_dev->pdev->dev);
 #endif
+
+        return 0;
 }
 
 static void shmob_drm_clk_off(struct shmob_drm_device *sdev)
@@ -161,6 +168,7 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
         struct drm_device *dev = sdev->ddev;
         struct drm_plane *plane;
         u32 value;
+        int ret;
 
         if (scrtc->started)
                 return;
@@ -170,7 +178,9 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
                 return;
 
         /* Enable clocks before accessing the hardware. */
-        shmob_drm_clk_on(sdev);
+        ret = shmob_drm_clk_on(sdev);
+        if (ret < 0)
+                return;
 
         /* Reset and enable the LCDC. */
         lcdc_write(sdev, LDCNT2R, lcdc_read(sdev, LDCNT2R) | LDCNT2R_BR);