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pwm: stm32: Refuse too small period requests

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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: 7edf736920 ("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>
This commit is contained in:
Uwe Kleine-König 2024-06-21 16:37:12 +02:00 committed by Greg Kroah-Hartman
parent 2c43adf364
commit 2e6bbfa1ab
1 changed files with 3 additions and 0 deletions
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3
drivers/pwm/pwm-stm32.c
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@ -340,6 +340,9 @@ static int stm32_pwm_config(struct stm32_pwm *priv, int ch,
prd = div;
if (!prd)
return -EINVAL;
if (prescaler > MAX_TIM_PSC)
return -EINVAL;