[PATCH] pwm: bcm-iproc: handle clk_get_rate() return
From: Scott Branden
Date: Fri Jul 17 2020 - 13:07:59 EST
From: Rayagonda Kokatanur <rayagonda.kokatanur@xxxxxxxxxxxx>
Handle clk_get_rate() returning <= 0 condition to avoid
possible division by zero.
Fixes: daa5abc41c80 ("pwm: Add support for Broadcom iProc PWM controller")
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@xxxxxxxxxxxx>
Signed-off-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
---
drivers/pwm/pwm-bcm-iproc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c
index 1f829edd8ee7..72a8607b6c8d 100644
--- a/drivers/pwm/pwm-bcm-iproc.c
+++ b/drivers/pwm/pwm-bcm-iproc.c
@@ -86,6 +86,11 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
u32 value, prescale;
rate = clk_get_rate(ip->clk);
+ if (rate == 0) {
+ state->period = 0;
+ state->duty_cycle = 0;
+ return;
+ }
value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);
--
2.17.1