[PATCH v2] misc: atmel-ssc: Handle return value of clk_prepare_enable and clk_prepare

[Arvind Yadav]

clk_prepare_enable() and clk_prepare() can fail here and
we must check its return value.

Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
---
 drivers/misc/atmel-ssc.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
index b2a0340..df34b81 100644
--- a/drivers/misc/atmel-ssc.c
+++ b/drivers/misc/atmel-ssc.c
@@ -30,6 +30,7 @@ struct ssc_device *ssc_request(unsigned int ssc_num)
 {
        int ssc_valid = 0;
        struct ssc_device *ssc;
+       int ret;
 
        spin_lock(&user_lock);
        list_for_each_entry(ssc, &ssc_list, list) {
@@ -60,7 +61,11 @@ struct ssc_device *ssc_request(unsigned int ssc_num)
        ssc->user++;
        spin_unlock(&user_lock);
 
-       clk_prepare(ssc->clk);
+       ret = clk_prepare(ssc->clk);
+       if (ret) {
+               pr_err("Failed to prepare clock\n");
+               return ERR_PTR(ret);
+       }
 
        return ssc;
 }
@@ -195,6 +200,7 @@ static int ssc_probe(struct platform_device *pdev)
        struct resource *regs;
        struct ssc_device *ssc;
        const struct atmel_ssc_platform_data *plat_dat;
+       int ret;
 
        ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL);
        if (!ssc) {
@@ -229,7 +235,9 @@ static int ssc_probe(struct platform_device *pdev)
        }
 
        /* disable all interrupts */
-       clk_prepare_enable(ssc->clk);
+       ret = clk_prepare_enable(ssc->clk);
+       if (ret)
+               return ret;
        ssc_writel(ssc->regs, IDR, -1);
        ssc_readl(ssc->regs, SR);
        clk_disable_unprepare(ssc->clk);
-- 
1.9.1