diff options
| author | Nick Piggin <npiggin@suse.de> | 2008-06-05 22:46:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-06-06 11:29:12 -0700 |
| commit | 81c6ce9bd3ed3a88caeb9ed97d874450d53339dc (patch) | |
| tree | 90e93d92be9aa37fa003c37a3cd5da732d0d4882 /drivers/char/vt.c | |
| parent | dfcceb26f89da86ec4ac9583c4515504af8c6c84 (diff) | |
| download | lwn-81c6ce9bd3ed3a88caeb9ed97d874450d53339dc.tar.gz lwn-81c6ce9bd3ed3a88caeb9ed97d874450d53339dc.zip | |
vt: fix vc_resize locking
Lockdep says we can't take tasklist lock or sighand lock inside ctrl_lock.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Alan Cox <alan@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
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 | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c index b8b2498f57af..935f1c207a1f 100644 --- a/drivers/char/vt.c +++ b/drivers/char/vt.c @@ -909,7 +909,7 @@ 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; + struct pid *pgrp = NULL; memset(&ws, 0, sizeof(ws)); ws.ws_row = vc->vc_rows; @@ -917,11 +917,14 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines) 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) + spin_lock_irq(&vc->vc_tty->ctrl_lock); + if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col)) + pgrp = get_pid(vc->vc_tty->pgrp); + spin_unlock_irq(&vc->vc_tty->ctrl_lock); + if (pgrp) { kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1); - spin_unlock_irqrestore(&vc->vc_tty->ctrl_lock, flags); + put_pid(pgrp); + } *cws = ws; mutex_unlock(&vc->vc_tty->termios_mutex); } |