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pwm: sanity check values before passing them to the drivers 

Check for valid period size before calling ops->config. This fixes
the pxa driver which otherwise does a division by zero. While at
it, also check for duty_ns being smaller or equal to period_ns.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
This commit is contained in:
Sascha Hauer 2013-04-07 11:50:24 +02:00
parent ab8a576a09
commit f043520c5a
1 changed files with 7 additions and 0 deletions
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7
drivers/pwm/core.c
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@ -177,6 +177,13 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
pwm->chip->duty_ns = duty_ns;
pwm->chip->period_ns = period_ns;
if (period_ns == 0)
return -EINVAL;
if (duty_ns > period_ns)
return -EINVAL;
return pwm->chip->ops->config(pwm->chip, duty_ns, period_ns);
}
EXPORT_SYMBOL_GPL(pwm_config);