linux/drivers/tty/tty_mutex.c
Jiri Slaby 906cbe1364 TTY: remove tty_locked
We used it really only serial and ami_serial. The rest of the
callsites were BUG/WARN_ONs to check if BTM is held. Now that we
pruned tty_locked from both of the real users, we can get rid of
tty_lock along with __big_tty_mutex_owner.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 10:34:07 -07:00

33 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);