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authorPeter Hurley <peter@hurleysoftware.com>2013-06-15 09:14:23 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-23 16:43:01 -0700
commit6a1c0680cf3ba94356ecd58833e1540c93472a57 (patch)
treed370b0888214bb59049181ac98c567d153263f48 /drivers/tty/tty_ldisc.c
parenta2f73be8ee36e48f11f89ab705beb3c587a2f320 (diff)
downloadop-kernel-dev-6a1c0680cf3ba94356ecd58833e1540c93472a57.zip
op-kernel-dev-6a1c0680cf3ba94356ecd58833e1540c93472a57.tar.gz
tty: Convert termios_mutex to termios_rwsem
termios is commonly accessed unsafely (especially by N_TTY) because the existing mutex forces exclusive access. Convert existing usage. Signed-off-by: Peter Hurley <peter@hurleysoftware.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.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index e52d615..6458e11 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -415,14 +415,14 @@ EXPORT_SYMBOL_GPL(tty_ldisc_flush);
* they are not on hot paths so a little discipline won't do
* any harm.
*
- * Locking: takes termios_mutex
+ * Locking: takes termios_rwsem
*/
static void tty_set_termios_ldisc(struct tty_struct *tty, int num)
{
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
tty->termios.c_line = num;
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
}
/**
@@ -602,11 +602,11 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
static void tty_reset_termios(struct tty_struct *tty)
{
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
tty->termios = tty->driver->init_termios;
tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios);
tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios);
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
}
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