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pwm: bcm2835: Prevent division by zero 

It's possible that the PWM clock becomes an orphan. So better check the
result of clk_get_rate() in order to prevent a division by zero.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
hifive-unleashed-5.1
Stefan Wahren 2015-12-01 22:55:40 +00:00 committed by Thierry Reding
parent ebe88b6ae4
commit fd13c14426
1 changed files with 9 additions and 1 deletions
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10
drivers/pwm/pwm-bcm2835.c
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@ -65,7 +65,15 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
unsigned long scaler = NSEC_PER_SEC / clk_get_rate(pc->clk);
unsigned long rate = clk_get_rate(pc->clk);
unsigned long scaler;
if (!rate) {
dev_err(pc->dev, "failed to get clock rate\n");
return -EINVAL;
}
scaler = NSEC_PER_SEC / rate;
if (period_ns <= MIN_PERIOD) {
dev_err(pc->dev, "period %d not supported, minimum %d\n",