mmc: dw_mmc: exynos: fix the suspend/resume issue for exynos5433

commit e22842dd64bf86753d3f2b6ea474d73fc1e6ca24 upstream.

Before enabling the clock, dwmmc exynos driver is trying to access the
register. Then the kernel panic can be occurred.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index fa41d94..a84aa3f 100644 (file)
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -165,9 +165,15 @@ static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing)
 static int dw_mci_exynos_runtime_resume(struct device *dev)
 {
        struct dw_mci *host = dev_get_drvdata(dev);
+       int ret;
+
+       ret = dw_mci_runtime_resume(dev);
+       if (ret)
+               return ret;
 
        dw_mci_exynos_config_smu(host);
-       return dw_mci_runtime_resume(dev);
+
+       return ret;
 }
 
 /**