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Commit ecfbbd83 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Greg Kroah-Hartman
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pwm: fsl-ftm: Handle clk_get_rate() returning 0 



[ Upstream commit 928446a5302eee30ebb32075c0db5dda5a138fb7 ]

Considering that the driver doesn't enable the used clocks (and also
that clk_get_rate() returns 0 if CONFIG_HAVE_CLK is unset) better check
the return value of clk_get_rate() for being non-zero before dividing by
it.

Fixes: 3479bbd1 ("pwm: fsl-ftm: More relaxed permissions for updating period")
Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/b68351a51017035651bc62ad3146afcb706874f0.1743501688.git.u.kleine-koenig@baylibre.com


Signed-off-by: default avatarUwe Kleine-König <ukleinek@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 8b9f6072

drivers/pwm/pwm-fsl-ftm.c

+6 −0
Original line number Diff line number Diff line
@@ -123,6 +123,9 @@ static unsigned int fsl_pwm_ticks_to_ns(struct fsl_pwm_chip *fpc, 
	unsigned long long exval;



	rate = clk_get_rate(fpc->clk[fpc->period.clk_select]);

	if (rate >> fpc->period.clk_ps == 0)

		return 0;



	exval = ticks;

	exval *= 1000000000UL;

	do_div(exval, rate >> fpc->period.clk_ps);
@@ -195,6 +198,9 @@ static unsigned int fsl_pwm_calculate_duty(struct fsl_pwm_chip *fpc, 
	unsigned int period = fpc->period.mod_period + 1;

	unsigned int period_ns = fsl_pwm_ticks_to_ns(fpc, period);



	if (!period_ns)

		return 0;



	duty = (unsigned long long)duty_ns * period;

	do_div(duty, period_ns);