diff options
| -rw-r--r-- | drivers/misc/qcom/qdsp6v2/ultrasound/usf.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/misc/qcom/qdsp6v2/ultrasound/usf.c b/drivers/misc/qcom/qdsp6v2/ultrasound/usf.c index 3bb95f50bc13..52f7d3d2f268 100644 --- a/drivers/misc/qcom/qdsp6v2/ultrasound/usf.c +++ b/drivers/misc/qcom/qdsp6v2/ultrasound/usf.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2011-2016, The Linux Foundation. All rights reserved. +/* Copyright (c) 2011-2017, 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 @@ -179,7 +179,7 @@ static const int s_button_map[] = { }; /* The opened devices container */ -static int s_opened_devs[MAX_DEVS_NUMBER]; +static atomic_t s_opened_devs[MAX_DEVS_NUMBER]; static struct wakeup_source usf_wakeup_source; @@ -2338,14 +2338,11 @@ static uint16_t add_opened_dev(int minor) uint16_t ind = 0; for (ind = 0; ind < MAX_DEVS_NUMBER; ++ind) { - if (minor == s_opened_devs[ind]) { + if (minor == atomic_cmpxchg(&s_opened_devs[ind], 0, minor)) { pr_err("%s: device %d is already opened\n", __func__, minor); return USF_UNDEF_DEV_ID; - } - - if (s_opened_devs[ind] == 0) { - s_opened_devs[ind] = minor; + } else { pr_debug("%s: device %d is added; ind=%d\n", __func__, minor, ind); return ind; @@ -2401,7 +2398,7 @@ static int usf_release(struct inode *inode, struct file *file) usf_disable(&usf->usf_tx); usf_disable(&usf->usf_rx); - s_opened_devs[usf->dev_ind] = 0; + atomic_set(&s_opened_devs[usf->dev_ind], 0); wakeup_source_trash(&usf_wakeup_source); mutex_unlock(&usf->mutex); |