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TTY: remove tty_locked

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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>
This commit is contained in:
Jiri Slaby
2011-07-14 14:35:14 +02:00
committed by Greg Kroah-Hartman
parent eff4b0b9fe
commit 906cbe1364
5 changed files with 2 additions and 21 deletions
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12
drivers/tty/tty_mutex.c
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@@ -15,30 +15,18 @@
* Don't use in new code.
*/
static DEFINE_MUTEX(big_tty_mutex);
struct task_struct *__big_tty_mutex_owner;
EXPORT_SYMBOL_GPL(__big_tty_mutex_owner);
/*
* Getting the big tty mutex.
*/
void __lockfunc tty_lock(void)
{
struct task_struct *task = current;
WARN_ON(__big_tty_mutex_owner == task);
mutex_lock(&big_tty_mutex);
__big_tty_mutex_owner = task;
}
EXPORT_SYMBOL(tty_lock);
void __lockfunc tty_unlock(void)
{
struct task_struct *task = current;
WARN_ON(__big_tty_mutex_owner != task);
__big_tty_mutex_owner = NULL;
mutex_unlock(&big_tty_mutex);
}
EXPORT_SYMBOL(tty_unlock);