pwm: bcm-iproc: handle clk_get_rate() return (6ced5ff0) · Commits · 戴 / test

Handle clk_get_rate() returning 0 to avoid possible division by zero. Fixes: ("pwm: Add support for Broadcom iProc PWM controller") Signed-off-by:

drivers/pwm/pwm-bcm-iproc.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -85,8 +85,6 @@ static void iproc_pwmc_get_state(struct pwm_chip chip, struct pwm_device pwm,
		u64 tmp, multi, rate;
		u32 value, prescale;

		rate = clk_get_rate(ip->clk);

		value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);

		if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm)))
		@@ -99,6 +97,13 @@ static void iproc_pwmc_get_state(struct pwm_chip chip, struct pwm_device pwm,
		else
		state->polarity = PWM_POLARITY_INVERSED;

		rate = clk_get_rate(ip->clk);
		if (rate == 0) {
		state->period = 0;
		state->duty_cycle = 0;
		return;
		}

		value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET);
		prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm);
		prescale &= IPROC_PWM_PRESCALE_MAX;