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leds: mt6323: move period calculation 

clang static analysis reports this problem

leds-mt6323.c:275:12: warning: Division by zero
        duty_hw = MT6323_CAL_HW_DUTY(*delay_on, period);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This is because period can be 0.

	period = *delay_on + *delay_off;

There is a later check that *delay_on/off are valid.

	if (!*delay_on && !*delay_off) {
		*delay_on = 500;
		*delay_off = 500;
	}

Setting the delay_on/off means period needs to be recalculated
anyway.  So move the period statements after this check.

Fixes: 216ec6cc4c ("leds: Add LED support for MT6323 PMIC")

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Tom Rix 2020-08-09 09:32:21 -07:00 committed by Pavel Machek
parent 2d26684a4a
commit fa31311c31
1 changed files with 9 additions and 9 deletions
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18
drivers/leds/leds-mt6323.c
View File

@ -248,15 +248,6 @@ static int mt6323_led_set_blink(struct led_classdev *cdev,
u8 duty_hw;
int ret;
/*
* Units are in ms, if over the hardware able
* to support, fallback into software blink
*/
period = *delay_on + *delay_off;
if (period > MT6323_MAX_PERIOD)
return -EINVAL;
/*
* LED subsystem requires a default user
* friendly blink pattern for the LED so using
@ -268,6 +259,15 @@ static int mt6323_led_set_blink(struct led_classdev *cdev,
*delay_off = 500;
}
/*
* Units are in ms, if over the hardware able
* to support, fallback into software blink
*/
period = *delay_on + *delay_off;
if (period > MT6323_MAX_PERIOD)
return -EINVAL;
/*
* Calculate duty_hw based on the percentage of period during
* which the led is ON.