[PATCH 3/5] drm/exynos/exynos7_drm_decon: free resources when clk_set_parent() failed.

[Jian Zhang]

In exynos7_decon_resume, When it fails, we must use clk_disable_unprepare()
to free resource that have been used.

Fixes: 6f83d20838c09 ("drm/exynos: use DRM_DEV_ERROR to print out error message")
Reported-by: Hulk Robot <hulkci at huawei.com>
Signed-off-by: Jian Zhang <zhangjian210 at huawei.com>
---
 drivers/gpu/drm/exynos/exynos7_drm_decon.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
index c04264f70ad1..3c31405600f0 100644
--- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
@@ -800,31 +800,40 @@ static int exynos7_decon_resume(struct device *dev)
 	if (ret < 0) {
 		DRM_DEV_ERROR(dev, "Failed to prepare_enable the pclk [%d]\n",
 			      ret);
-		return ret;
+		goto err_pclk_enable;
 	}
 
 	ret = clk_prepare_enable(ctx->aclk);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dev, "Failed to prepare_enable the aclk [%d]\n",
 			      ret);
-		return ret;
+		goto err_aclk_enable;
 	}
 
 	ret = clk_prepare_enable(ctx->eclk);
 	if  (ret < 0) {
 		DRM_DEV_ERROR(dev, "Failed to prepare_enable the eclk [%d]\n",
 			      ret);
-		return ret;
+		goto err_eclk_enable;
 	}
 
 	ret = clk_prepare_enable(ctx->vclk);
 	if  (ret < 0) {
 		DRM_DEV_ERROR(dev, "Failed to prepare_enable the vclk [%d]\n",
 			      ret);
-		return ret;
+		goto err_vclk_enable;
 	}
 
 	return 0;
+
+err_vclk_enable:
+	clk_disable_unprepare(ctx->eclk);
+err_eclk_enable:
+	clk_disable_unprepare(ctx->aclk);
+err_aclk_enable:
+	clk_disable_unprepare(ctx->pclk);
+err_pclk_enable:
+	return ret;
 }
 #endif
 
-- 
2.17.1