[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>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
index fec76d3f056c..dd7b258a9802 100644
--- 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)) {