mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 21:57:43 +00:00
6d31a88cb2
I sent GregKH this after the pre-requisites. He dropped the pre-requesites for good reason and unfortunately then applied this patch. Without this reverted you get random kernel memory corruption which will make bisecting anything between it and the properly applied patches a complete sod. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
32 lines
659 B
C
32 lines
659 B
C
#include <linux/tty.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/semaphore.h>
|
|
#include <linux/sched.h>
|
|
|
|
/*
|
|
* The 'big tty mutex'
|
|
*
|
|
* This mutex is taken and released by tty_lock() and tty_unlock(),
|
|
* replacing the older big kernel lock.
|
|
* It can no longer be taken recursively, and does not get
|
|
* released implicitly while sleeping.
|
|
*
|
|
* Don't use in new code.
|
|
*/
|
|
static DEFINE_MUTEX(big_tty_mutex);
|
|
|
|
/*
|
|
* Getting the big tty mutex.
|
|
*/
|
|
void __lockfunc tty_lock(void)
|
|
{
|
|
mutex_lock(&big_tty_mutex);
|
|
}
|
|
EXPORT_SYMBOL(tty_lock);
|
|
|
|
void __lockfunc tty_unlock(void)
|
|
{
|
|
mutex_unlock(&big_tty_mutex);
|
|
}
|
|
EXPORT_SYMBOL(tty_unlock);
|