pwm: img: Test clock rate to avoid division by 0

The clk API may return 0 on clk_get_rate(), so we should check the
result before using it as a divisor.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
index 8a029f9bc18c..2fb30deee345 100644
--- a/drivers/pwm/pwm-img.c
+++ b/drivers/pwm/pwm-img.c
@@ -237,6 +237,11 @@ static int img_pwm_probe(struct platform_device *pdev)
         }
 
         clk_rate = clk_get_rate(pwm->pwm_clk);
+        if (!clk_rate) {
+                dev_err(&pdev->dev, "pwm clock has no frequency\n");
+                ret = -EINVAL;
+                goto disable_pwmclk;
+        }
 
         /* The maximum input clock divider is 512 */
         val = (u64)NSEC_PER_SEC * 512 * pwm->data->max_timebase;