[PATCH v2] memory: exynos5422-dmc: handle clock enable failures

[Jiawen Liu]

Check the return values of clk_prepare_enable() for fout_bpll and
mout_bpll.

If enabling fout_bpll fails, propagate the error. If enabling mout_bpll
fails, disable fout_bpll before returning. This keeps the clock enable
count balanced on probe error paths.

Fixes: 6e7674c3c6df ("memory: Add DMC driver for Exynos5422")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiawen Liu <1298662399@xxxxxx>
---
Changes in v2:
- Use the full author name in From and Signed-off-by.
- Add Fixes and Cc stable tags.
- Generate the submission with git format-patch.

 drivers/memory/samsung/exynos5422-dmc.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index 788d49c688b1..98c319552583 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1297,8 +1297,15 @@ static int exynos5_dmc_init_clks(struct exynos5_dmc *dmc)
 	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.
-- 
2.34.1