[media] mt9p031: Check return value of clk_prepare_enable/clk_set_rate

clk_set_rate(), clk_prepare_enable() functions can fail, so check the return
values to avoid surprises.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
index fec76d3..dd7b258 100644 (file)
--- a/drivers/media/i2c/mt9p031.c
+++ b/drivers/media/i2c/mt9p031.c
@@ -232,12 +232,15 @@ static int mt9p031_clk_setup(struct mt9p031 *mt9p031)
 
        struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
        struct mt9p031_platform_data *pdata = mt9p031->pdata;
+       int ret;
 
        mt9p031->clk = devm_clk_get(&client->dev, NULL);
        if (IS_ERR(mt9p031->clk))
                return PTR_ERR(mt9p031->clk);
 
-       clk_set_rate(mt9p031->clk, pdata->ext_freq);
+       ret = clk_set_rate(mt9p031->clk, pdata->ext_freq);
+       if (ret < 0)
+               return ret;
 
        /* If the external clock frequency is out of bounds for the PLL use the
         * pixel clock divider only and disable the PLL.
@@ -318,8 +321,14 @@ static int mt9p031_power_on(struct mt9p031 *mt9p031)
                return ret;
 
        /* Enable clock */
-       if (mt9p031->clk)
-               clk_prepare_enable(mt9p031->clk);
+       if (mt9p031->clk) {
+               ret = clk_prepare_enable(mt9p031->clk);
+               if (ret) {
+                       regulator_bulk_disable(ARRAY_SIZE(mt9p031->regulators),
+                                              mt9p031->regulators);
+                       return ret;
+               }
+       }
 
        /* Now RESET_BAR must be high */
        if (gpio_is_valid(mt9p031->reset)) {