diff options
Diffstat (limited to 'drivers/uio/msm_sharedmem/sharedmem_qmi.c')
| -rw-r--r-- | drivers/uio/msm_sharedmem/sharedmem_qmi.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/uio/msm_sharedmem/sharedmem_qmi.c b/drivers/uio/msm_sharedmem/sharedmem_qmi.c index 3b04c582cb3..8bd99e1cab0 100644 --- a/drivers/uio/msm_sharedmem/sharedmem_qmi.c +++ b/drivers/uio/msm_sharedmem/sharedmem_qmi.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2014, The Linux Foundation. All rights reserved. +/* Copyright (c) 2014, 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 @@ -221,6 +221,7 @@ static int sharedmem_qmi_req_cb(struct qmi_handle *handle, void *conn_h, #define DEBUG_BUF_SIZE (2048) static char *debug_buffer; static u32 debug_data_size; +static struct mutex dbg_buf_lock; /* mutex for debug_buffer */ static ssize_t debug_read(struct file *file, char __user *buf, size_t count, loff_t *file_pos) @@ -276,21 +277,29 @@ static u32 fill_debug_info(char *buffer, u32 buffer_size) static int debug_open(struct inode *inode, struct file *file) { u32 buffer_size; - if (debug_buffer != NULL) + mutex_lock(&dbg_buf_lock); + if (debug_buffer != NULL) { + mutex_unlock(&dbg_buf_lock); return -EBUSY; + } buffer_size = DEBUG_BUF_SIZE; debug_buffer = kzalloc(buffer_size, GFP_KERNEL); - if (debug_buffer == NULL) + if (debug_buffer == NULL) { + mutex_unlock(&dbg_buf_lock); return -ENOMEM; + } debug_data_size = fill_debug_info(debug_buffer, buffer_size); + mutex_unlock(&dbg_buf_lock); return 0; } static int debug_close(struct inode *inode, struct file *file) { + mutex_lock(&dbg_buf_lock); kfree(debug_buffer); debug_buffer = NULL; debug_data_size = 0; + mutex_unlock(&dbg_buf_lock); return 0; } @@ -321,6 +330,7 @@ static void debugfs_init(void) { struct dentry *f_ent; + mutex_init(&dbg_buf_lock); dir_ent = debugfs_create_dir("rmt_storage", NULL); if (IS_ERR(dir_ent)) { pr_err("Failed to create debug_fs directory\n"); @@ -349,6 +359,7 @@ static void debugfs_init(void) static void debugfs_exit(void) { debugfs_remove_recursive(dir_ent); + mutex_destroy(&dbg_buf_lock); } static void sharedmem_qmi_svc_recv_msg(struct work_struct *work) |