diff options
| -rw-r--r-- | drivers/pwm/pwm-qpnp.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-qpnp.c b/drivers/pwm/pwm-qpnp.c index ef5edd3cd7d..e31d24ca821 100644 --- a/drivers/pwm/pwm-qpnp.c +++ b/drivers/pwm/pwm-qpnp.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. +/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -1227,6 +1227,7 @@ static int qpnp_pwm_config(struct pwm_chip *pwm_chip, int rc; unsigned long flags; struct qpnp_pwm_chip *chip = qpnp_pwm_from_pwm_chip(pwm_chip); + int prev_period_us = chip->pwm_config.pwm_period; if ((unsigned)period_ns < PM_PWM_PERIOD_MIN * NSEC_PER_USEC) { pr_err("Invalid pwm handle or parameters\n"); @@ -1235,7 +1236,8 @@ static int qpnp_pwm_config(struct pwm_chip *pwm_chip, spin_lock_irqsave(&chip->lpg_lock, flags); - if (pwm->period != period_ns) { + if (prev_period_us > INT_MAX / NSEC_PER_USEC || + prev_period_us * NSEC_PER_USEC != period_ns) { qpnp_lpg_calc_period(LVL_NSEC, period_ns, chip); qpnp_lpg_save_period(chip); pwm->period = period_ns; |