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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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4
drivers/tty/pty.c
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@@ -287,7 +287,7 @@ static int pty_resize(struct tty_struct *tty, struct winsize *ws)
struct tty_struct *pty = tty->link;
/* For a PTY we need to lock the tty side */
mutex_lock(&tty->termios_mutex);
down_write(&tty->termios_rwsem);
if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
goto done;
@@ -314,7 +314,7 @@ static int pty_resize(struct tty_struct *tty, struct winsize *ws)
tty->winsize = *ws;
pty->winsize = *ws; /* Never used so will go away soon */
done:
mutex_unlock(&tty->termios_mutex);
up_write(&tty->termios_rwsem);
return 0;
}