3.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peter Hurley <pe...@hurleysoftware.com>
commit 42458f41d08f0873299e830464c1232a6839297d upstream.
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.
Signed-off-by: Peter Hurley <pe...@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/tty/n_tty.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2253,6 +2253,9 @@ static ssize_t n_tty_read(struct tty_str
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);
@@ -2263,8 +2266,6 @@ static ssize_t n_tty_read(struct tty_str
if (b - buf)
retval = b - buf;
- n_tty_set_room(tty);
- up_read(&tty->termios_rwsem);
return retval;
}
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