From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx>
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: 7edf7369205b ("pwm: Add driver for STM32 plaftorm")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Trevor Gamblin <tgamblin@xxxxxxxxxxxx>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/b86f62f099983646f97eeb6bfc0117bb2d0c340d.1718979150.git.u.kleine-koenig@xxxxxxxxxxxx
Signed-off-by: Uwe Kleine-König <ukleinek@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pwm/pwm-stm32.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -337,6 +337,9 @@ static int stm32_pwm_config(struct stm32
prd = div;
+ if (!prd)
+ return -EINVAL;
+
if (prescaler > MAX_TIM_PSC)
return -EINVAL;
Patches currently in stable-queue which might be from u.kleine-koenig@xxxxxxxxxxxx are
queue-5.4/pwm-stm32-refuse-too-small-period-requests.patch
