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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>

authored by

Uwe Kleine-König and committed by
Uwe Kleine-König c45fcf46 1613e604

+2
+2
drivers/pwm/pwm-stm32.c
··· 337 337 338 338 prd = mul_u64_u64_div_u64(period_ns, clk_get_rate(priv->clk), 339 339 (u64)NSEC_PER_SEC * (prescaler + 1)); 340 + if (!prd) 341 + return -EINVAL; 340 342 341 343 /* 342 344 * All channels share the same prescaler and counter so when two