From 1541f845d123a48fbca3cee32b2963b3fb3da83a Mon Sep 17 00:00:00 2001 From: Ivo Sieben Date: Thu, 3 May 2012 14:37:43 +0200 Subject: 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 Acked-by: Alan Cox Signed-off-by: Greg Kroah-Hartman 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; } diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h index ff7dc08..fb79dd8d 100644 --- a/include/linux/tty_ldisc.h +++ b/include/linux/tty_ldisc.h @@ -110,6 +110,7 @@ #include #include #include +#include struct tty_ldisc_ops { int magic; @@ -154,6 +155,7 @@ struct tty_ldisc_ops { struct tty_ldisc { struct tty_ldisc_ops *ops; atomic_t users; + wait_queue_head_t wq_idle; }; #define TTY_LDISC_MAGIC 0x5403 -- cgit v0.10.2