tree 6724b07e24929eba5c6df31f07871d9d6b4aa296
parent 04f378b198da233ca0aca341b113dc6579d46123
author Alan Cox <alan@lxorguk.ukuu.org.uk> 1209542010 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1209569380 -0700

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>