diff options
Diffstat (limited to 'drivers/thermal/msm_thermal-dev.c')
| -rw-r--r-- | drivers/thermal/msm_thermal-dev.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/thermal/msm_thermal-dev.c b/drivers/thermal/msm_thermal-dev.c index e6af6b884e99..ead9765666c8 100644 --- a/drivers/thermal/msm_thermal-dev.c +++ b/drivers/thermal/msm_thermal-dev.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved. +/* Copyright (c) 2013-2017, 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 @@ -35,6 +35,7 @@ static unsigned int freq_table_len[NR_CPUS], freq_table_set[NR_CPUS]; static unsigned int voltage_table_set[NR_CPUS]; static unsigned int *freq_table_ptr[NR_CPUS]; static uint32_t *voltage_table_ptr[NR_CPUS]; +static DEFINE_MUTEX(ioctl_access_mutex); static int msm_thermal_ioctl_open(struct inode *node, struct file *filep) { @@ -291,8 +292,9 @@ static long msm_thermal_ioctl_process(struct file *filep, unsigned int cmd, ret = validate_and_copy(&cmd, &arg, &query); if (ret) - goto process_exit; + return ret; + mutex_lock(&ioctl_access_mutex); switch (cmd) { case MSM_THERMAL_SET_CPU_MAX_FREQUENCY: ret = msm_thermal_set_frequency(query.cpu_freq.cpu_num, @@ -321,6 +323,7 @@ static long msm_thermal_ioctl_process(struct file *filep, unsigned int cmd, goto process_exit; } process_exit: + mutex_unlock(&ioctl_access_mutex); return ret; } |