[RFT v2] mfd: exynos-lpass: Handle return value of clk_prepare_enable

[Arvind Yadav]

clk_prepare_enable() can fail here and we must check its return value.
we must call pm_runtime_disable() and pm_runtime_set_suspended(),
If exynos_lpass_probe is not successful.

Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
---
changes in v2:
             added regmap_exit(lpass->top) and blank line before return.

 drivers/mfd/exynos-lpass.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c
index ca829f8..1ab7210 100644
--- a/drivers/mfd/exynos-lpass.c
+++ b/drivers/mfd/exynos-lpass.c
@@ -73,9 +73,13 @@ static void exynos_lpass_core_sw_reset(struct exynos_lpass 
*lpass, int mask)
        regmap_write(lpass->top, SFR_LPASS_CORE_SW_RESET, val);
 }
 
-static void exynos_lpass_enable(struct exynos_lpass *lpass)
+static int exynos_lpass_enable(struct exynos_lpass *lpass)
 {
-       clk_prepare_enable(lpass->sfr0_clk);
+       int ret;
+
+       ret = clk_prepare_enable(lpass->sfr0_clk);
+       if (ret)
+               return ret;
 
        /* Unmask SFR, DMA and I2S interrupt */
        regmap_write(lpass->top, SFR_LPASS_INTR_CA5_MASK,
@@ -87,6 +91,8 @@ static void exynos_lpass_enable(struct exynos_lpass *lpass)
        exynos_lpass_core_sw_reset(lpass, LPASS_I2S_SW_RESET);
        exynos_lpass_core_sw_reset(lpass, LPASS_DMA_SW_RESET);
        exynos_lpass_core_sw_reset(lpass, LPASS_MEM_SW_RESET);
+
+       return 0;
 }
 
 static void exynos_lpass_disable(struct exynos_lpass *lpass)
@@ -112,6 +118,7 @@ static int exynos_lpass_probe(struct platform_device *pdev)
        struct exynos_lpass *lpass;
        void __iomem *base_top;
        struct resource *res;
+       int ret;
 
        lpass = devm_kzalloc(dev, sizeof(*lpass), GFP_KERNEL);
        if (!lpass)
@@ -136,7 +143,13 @@ static int exynos_lpass_probe(struct platform_device *pdev)
        platform_set_drvdata(pdev, lpass);
        pm_runtime_set_active(dev);
        pm_runtime_enable(dev);
-       exynos_lpass_enable(lpass);
+       ret = exynos_lpass_enable(lpass);
+       if (ret) {
+               pm_runtime_disable(dev);
+               pm_runtime_set_suspended(dev);
+               regmap_exit(lpass->top);
+               return ret;
+       }
 
        return devm_of_platform_populate(dev);
 }
@@ -167,9 +180,7 @@ static int __maybe_unused exynos_lpass_resume(struct device 
*dev)
 {
        struct exynos_lpass *lpass = dev_get_drvdata(dev);
 
-       exynos_lpass_enable(lpass);
-
-       return 0;
+       return exynos_lpass_enable(lpass);
 }
 
 static const struct dev_pm_ops lpass_pm_ops = {
-- 
1.9.1