Commit d59bb703 authored Jun 21, 2024 by Uwe Kleine-König Committed by Greg Kroah-Hartman Jul 05, 2024

pwm: stm32: Refuse too small period requests



commit c45fcf46ca2368dafe7e5c513a711a6f0f974308 upstream.

If period_ns is small, prd might well become 0. Catch that case because
otherwise with

	regmap_write(priv->regmap, TIM_ARR, prd - 1);

a few lines down quite a big period is configured.

Fixes: 7edf7369 ("pwm: Add driver for STM32 plaftorm")
Cc: stable@vger.kernel.org
Reviewed-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/b86f62f099983646f97eeb6bfc0117bb2d0c340d.1718979150.git.u.kleine-koenig@baylibre.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 82982175

drivers/pwm/pwm-stm32.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -337,6 +337,9 @@ static int stm32_pwm_config(struct stm32_pwm *priv, int ch,

		prd = div;

		if (!prd)
		return -EINVAL;

		if (prescaler > MAX_TIM_PSC)
		return -EINVAL;