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| author | Uwe Kleine-König <u.kleine-koenig@baylibre.com> | 2024-06-21 16:37:12 +0200 |
|---|---|---|
| committer | Uwe Kleine-König <ukleinek@kernel.org> | 2024-06-21 16:39:34 +0200 |
| commit | c45fcf46ca2368dafe7e5c513a711a6f0f974308 (patch) | |
| tree | 22df1bcfab5b26f34dbc486eac939a3bba5567f0 | |
| parent | Linux 6.10-rc1 (diff) | |
| download | linux-c45fcf46ca2368dafe7e5c513a711a6f0f974308.tar.xz linux-c45fcf46ca2368dafe7e5c513a711a6f0f974308.zip | |
pwm: stm32: Refuse too small period requests
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: 7edf7369205b ("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>
| -rw-r--r-- | drivers/pwm/pwm-stm32.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c index a2f231d13a9f..3e7b2a8e34e7 100644 --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -337,6 +337,8 @@ static int stm32_pwm_config(struct stm32_pwm *priv, unsigned int ch, prd = mul_u64_u64_div_u64(period_ns, clk_get_rate(priv->clk), (u64)NSEC_PER_SEC * (prescaler + 1)); + if (!prd) + return -EINVAL; /* * All channels share the same prescaler and counter so when two |