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authorIvo Sieben <meltedpianoman@gmail.com>2012-05-03 14:37:43 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-10 11:24:03 -0700
commit1541f845d123a48fbca3cee32b2963b3fb3da83a (patch)
treeace9a1f9278ea84101359d189894c71548193136 /drivers/tty/tty_ldisc.c
parent3e62c413fb0c75c8cfaf086d00a9ecc6b55009d6 (diff)
downloadop-kernel-dev-1541f845d123a48fbca3cee32b2963b3fb3da83a.zip
op-kernel-dev-1541f845d123a48fbca3cee32b2963b3fb3da83a.tar.gz
tty: move global ldisc idle waitqueue to the individual ldisc
The global wait_queue that is used for line discipline idle handling is moved to a separate wait_queue for each line instance. This prevents unnecessary blocking on one line, because of idle handling on another line. Signed-off-by: Ivo Sieben <meltedpianoman@gmail.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_ldisc.c')
-rw-r--r--drivers/tty/tty_ldisc.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index fa65cde..173a900 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -28,7 +28,6 @@
static DEFINE_SPINLOCK(tty_ldisc_lock);
static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_wait);
-static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_idle);
/* Line disc dispatch table */
static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
@@ -65,7 +64,7 @@ static void put_ldisc(struct tty_ldisc *ld)
return;
}
local_irq_restore(flags);
- wake_up(&tty_ldisc_idle);
+ wake_up(&ld->wq_idle);
}
/**
@@ -200,6 +199,8 @@ static struct tty_ldisc *tty_ldisc_get(int disc)
ld->ops = ldops;
atomic_set(&ld->users, 1);
+ init_waitqueue_head(&ld->wq_idle);
+
return ld;
}
@@ -538,7 +539,7 @@ static void tty_ldisc_flush_works(struct tty_struct *tty)
static int tty_ldisc_wait_idle(struct tty_struct *tty, long timeout)
{
long ret;
- ret = wait_event_timeout(tty_ldisc_idle,
+ ret = wait_event_timeout(tty->ldisc->wq_idle,
atomic_read(&tty->ldisc->users) == 1, timeout);
return ret > 0 ? 0 : -EBUSY;
}
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