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tty: Convert termios_mutex to termios_rwsem

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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>
This commit is contained in:
Peter Hurley
2013-06-15 09:14:23 -04:00
committed by Greg Kroah-Hartman
parent a2f73be8ee
commit 6a1c0680cf
8 changed files with 70 additions and 69 deletions
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drivers/tty/n_tty.c
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@@ -1539,7 +1539,7 @@ int is_ignored(int sig)
* guaranteed that this function will not be re-entered or in progress
* when the ldisc is closed.
*
* Locking: Caller holds tty->termios_mutex
* Locking: Caller holds tty->termios_rwsem
*/
static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)