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authorPeter Hurley <peter@hurleysoftware.com>2013-06-15 09:14:31 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-23 16:43:02 -0700
commitd8c1f929aa8164cd8eaa830068d2fa3159c0764a (patch)
tree1371cfe90fffdcb7115b39c77e0f729c109efc69 /drivers/tty/tty_io.c
parentfb7aa03db605e4f0b9a62cd4c77177c2596edd95 (diff)
downloadop-kernel-dev-d8c1f929aa8164cd8eaa830068d2fa3159c0764a.zip
op-kernel-dev-d8c1f929aa8164cd8eaa830068d2fa3159c0764a.tar.gz
tty: Only guarantee termios read safety for throttle/unthrottle
No tty driver modifies termios during throttle() or unthrottle(). Therefore, only read safety is required. However, tty_throttle_safe and tty_unthrottle_safe must still be mutually exclusive; introduce throttle_mutex for that purpose. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_io.c')
-rw-r--r--drivers/tty/tty_io.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 639e24a..1b32da6 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3015,6 +3015,7 @@ void initialize_tty_struct(struct tty_struct *tty,
tty->session = NULL;
tty->pgrp = NULL;
mutex_init(&tty->legacy_mutex);
+ mutex_init(&tty->throttle_mutex);
init_rwsem(&tty->termios_rwsem);
init_ldsem(&tty->ldisc_sem);
init_waitqueue_head(&tty->write_wait);
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