From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/tty/tty_mutex.c | 52 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 kernel/drivers/tty/tty_mutex.c (limited to 'kernel/drivers/tty/tty_mutex.c') diff --git a/kernel/drivers/tty/tty_mutex.c b/kernel/drivers/tty/tty_mutex.c new file mode 100644 index 000000000..0efcf713b --- /dev/null +++ b/kernel/drivers/tty/tty_mutex.c @@ -0,0 +1,52 @@ +#include +#include +#include +#include +#include + +/* Legacy tty mutex glue */ + +/* + * Getting the big tty mutex. + */ + +void __lockfunc tty_lock(struct tty_struct *tty) +{ + if (tty->magic != TTY_MAGIC) { + pr_err("L Bad %p\n", tty); + WARN_ON(1); + return; + } + tty_kref_get(tty); + mutex_lock(&tty->legacy_mutex); +} +EXPORT_SYMBOL(tty_lock); + +void __lockfunc tty_unlock(struct tty_struct *tty) +{ + if (tty->magic != TTY_MAGIC) { + pr_err("U Bad %p\n", tty); + WARN_ON(1); + return; + } + mutex_unlock(&tty->legacy_mutex); + tty_kref_put(tty); +} +EXPORT_SYMBOL(tty_unlock); + +void __lockfunc tty_lock_slave(struct tty_struct *tty) +{ + if (tty && tty != tty->link) + tty_lock(tty); +} + +void __lockfunc tty_unlock_slave(struct tty_struct *tty) +{ + if (tty && tty != tty->link) + tty_unlock(tty); +} + +void tty_set_lock_subclass(struct tty_struct *tty) +{ + lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE); +} -- cgit 1.2.3-korg