diff options
| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2008-04-30 09:53:30 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 17:29:40 +0200 |
| commit | 47f86834bbd4193139d61d659bebf9ab9d691e37 (patch) | |
| tree | 6724b07e24929eba5c6df31f07871d9d6b4aa296 /drivers/char/vt.c | |
| parent | tty: BKL pushdown (diff) | |
| download | linux-47f86834bbd4193139d61d659bebf9ab9d691e37.tar.xz linux-47f86834bbd4193139d61d659bebf9ab9d691e37.zip | |
redo locking of tty->pgrp
Historically tty->pgrp and friends were pid_t and the code "knew" they were
safe. The change to pid structs opened up a few races and the removal of the
BKL in places made them quite hittable. We put tty->pgrp under the ctrl_lock
for the tty.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/vt.c')
| -rw-r--r-- | drivers/char/vt.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c index e64f0bf3624e..c71d1d0f13b9 100644 --- a/drivers/char/vt.c +++ b/drivers/char/vt.c @@ -909,15 +909,21 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines) if (vc->vc_tty) { struct winsize ws, *cws = &vc->vc_tty->winsize; + unsigned long flags; memset(&ws, 0, sizeof(ws)); ws.ws_row = vc->vc_rows; ws.ws_col = vc->vc_cols; ws.ws_ypixel = vc->vc_scan_lines; + + mutex_lock(&vc->vc_tty->termios_mutex); + spin_lock_irqsave(&vc->vc_tty->ctrl_lock, flags); if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) && vc->vc_tty->pgrp) kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1); + spin_unlock_irqrestore(&vc->vc_tty->ctrl_lock, flags); *cws = ws; + mutex_unlock(&vc->vc_tty->termios_mutex); } if (CON_IS_VISIBLE(vc)) |