Merge tag 'dma-buf-for-4.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / drivers / pwm / pwm-atmel-hlcdc.c

diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index e7a785fadcdf973390dcda8cfdf6f4b872acb2c3..522f7075bb1a42b14d699d5ee6548fe375fcdd53 100644 (file)
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -64,6 +64,9 @@ static int atmel_hlcdc_pwm_config(struct pwm_chip *c,
 
        if (!chip->errata || !chip->errata->slow_clk_erratum) {
                clk_freq = clk_get_rate(new_clk);
+               if (!clk_freq)
+                       return -EINVAL;
+
                clk_period_ns = (u64)NSEC_PER_SEC * 256;
                do_div(clk_period_ns, clk_freq);
        }
@@ -73,6 +76,9 @@ static int atmel_hlcdc_pwm_config(struct pwm_chip *c,
            clk_period_ns > period_ns) {
                new_clk = hlcdc->sys_clk;
                clk_freq = clk_get_rate(new_clk);
+               if (!clk_freq)
+                       return -EINVAL;
+
                clk_period_ns = (u64)NSEC_PER_SEC * 256;
                do_div(clk_period_ns, clk_freq);
        }