[PATCH] memory: exynos5422-dmc: handle clock enable failures

[Jiawen Liu]

Check clock-enable failures during probe.

If a later clock cannot be enabled, unwind clocks already enabled on
that path before returning the error.

Signed-off-by: jiawen <1298662399 at qq.com>
---
diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1297,8 +1297,15 @@
 	if (ret)
 		return ret;
 
-	clk_prepare_enable(dmc->fout_bpll);
-	clk_prepare_enable(dmc->mout_bpll);
+	ret = clk_prepare_enable(dmc->fout_bpll);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(dmc->mout_bpll);
+	if (ret) {
+		clk_disable_unprepare(dmc->fout_bpll);
+		return ret;
+	}
 
 	/*
 	 * Some bootloaders do not set clock routes correctly.