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[02/10] PLAT/Samsung/PWM: avoid division by zero

Message ID 1341767544-17447-3-git-send-email-jbe@pengutronix.de (mailing list archive)
State New, archived
Headers show

Commit Message

Juergen Borleis July 8, 2012, 5:12 p.m. UTC 
The pwm-beeper driver crashes the PWM driver by calling with a period time of
zero nanoseconds.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 arch/arm/plat-samsung/pwm.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/arm/plat-samsung/pwm.c b/arch/arm/plat-samsung/pwm.c
index c559d84..751a0bf 100644
--- a/arch/arm/plat-samsung/pwm.c
+++ b/arch/arm/plat-samsung/pwm.c
@@ -188,7 +188,10 @@  int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
 	tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id));
 	tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id));
 
-	period = NS_IN_HZ / period_ns;
+	if (period_ns)
+		period = NS_IN_HZ / period_ns;
+	else
+		period = 0;
 
 	pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
 		duty_ns, period_ns, period);