This is a note to let you know that I've just added the patch titled
n_tty: Ensure reader restarts worker for next reader
to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 42458f41d08f0873299e830464c1232a6839297d Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Date: Thu, 7 Nov 2013 13:59:46 -0500
Subject: n_tty: Ensure reader restarts worker for next reader
A departing reader must restart a flush_to_ldisc() worker _before_
the next reader enters the read loop; this is to avoid the new reader
concluding no more i/o is available and prematurely exiting, when the
old reader simply hasn't re-started the worker yet.
Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.12
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/n_tty.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 7cdd1eb9..a2b70c97 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2243,6 +2243,9 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
if (time)
timeout = time;
}
+ n_tty_set_room(tty);
+ up_read(&tty->termios_rwsem);
+
mutex_unlock(&ldata->atomic_read_lock);
remove_wait_queue(&tty->read_wait, &wait);
@@ -2253,8 +2256,6 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
if (b - buf)
retval = b - buf;
- n_tty_set_room(tty);
- up_read(&tty->termios_rwsem);
return retval;
}
--
1.8.4.3.gca3854a
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