From fd2529ba8fb44cd4b56f1069363b949644b42cec Mon Sep 17 00:00:00 2001 From: Manuel Fombuena Date: Thu, 2 Jul 2026 23:28:20 +0100 Subject: [PATCH] leds: st1202: Validate pattern input before stopping the sequence Input validation for pattern duration is performed inside the write loop, after the pattern sequence has already been stopped. If validation fails mid-loop the chip is left with the sequence stopped and partially written pattern data, with no recovery. Move all input validation before the mutex and before any hardware interaction, so an invalid input leaves the chip state unchanged. Signed-off-by: Manuel Fombuena Assisted-by: Claude:claude-sonnet-4-6 Link: https://patch.msgid.link/GV1PR08MB84975929B6ED7CDFBCEB7D76C5F52@GV1PR08MB8497.eurprd08.prod.outlook.com Signed-off-by: Lee Jones --- drivers/leds/leds-st1202.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/leds/leds-st1202.c b/drivers/leds/leds-st1202.c index 316ed8eb054f..a750c95ef3f8 100644 --- a/drivers/leds/leds-st1202.c +++ b/drivers/leds/leds-st1202.c @@ -228,6 +228,12 @@ static int st1202_led_pattern_set(struct led_classdev *ldev, if (len > ST1202_MAX_PATTERNS) return -EINVAL; + for (int patt = 0; patt < len; patt++) { + if (pattern[patt].delta_t < ST1202_MILLIS_PATTERN_DUR_MIN || + pattern[patt].delta_t > ST1202_MILLIS_PATTERN_DUR_MAX) + return -EINVAL; + } + guard(mutex)(&chip->lock); ret = st1202_write_reg(chip, ST1202_CONFIG_REG, ST1202_CONFIG_REG_SHFT); @@ -235,10 +241,6 @@ static int st1202_led_pattern_set(struct led_classdev *ldev, return ret; for (int patt = 0; patt < len; patt++) { - if (pattern[patt].delta_t < ST1202_MILLIS_PATTERN_DUR_MIN || - pattern[patt].delta_t > ST1202_MILLIS_PATTERN_DUR_MAX) - return -EINVAL; - ret = st1202_pwm_pattern_write(chip, led->led_num, patt, pattern[patt].brightness); if (ret != 0) return ret;