Project

General

Profile

Download (978 Bytes)

Bug #635 ยป mutexislocked.c

Broken regression test file - Evgeny Novikov, 01/29/2011 12:49 PM

 
/**
* The test checks model of mutex_is_locked. Should be safe.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/major.h>
#include <linux/fs.h>

static DEFINE_MUTEX(i_mutex);

static int misc_open(struct inode * inode, struct file * file);

static const struct file_operations misc_fops = {
.owner = THIS_MODULE,
.open = misc_open,
};

static int misc_open(struct inode * inode, struct file * file)
{
int is_locked = mutex_is_locked(&i_mutex);
if(is_locked) {
mutex_unlock(&i_mutex);
} else {
mutex_lock(&i_mutex);
mutex_unlock(&i_mutex);
}
return 0;
}

static int __init my_init(void)
{
if (register_chrdev(MISC_MAJOR,"misc",&misc_fops))
goto fail_register;
return 0;

fail_register:
return -1;
}

static void __exit my_exit(void)
{
}

module_init(my_init);
module_exit(my_exit);

MODULE_LICENSE("Apache 2.0");
MODULE_AUTHOR("LDV Project, Vadim Mutilin <mutilin@ispras.ru>");

    (1-1/1)