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authorOleg Nesterov <oleg@tv-sign.ru>2007-10-16 23:26:58 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:51 -0700
commit3ae4cbadf4bf97ee137b921a1b928d2a5dcd26ca (patch)
tree1d8bea4faeae056da20b2401645900daa3c86c55
parent2f4e6e2a814eb1305a873a045401708d73f870bc (diff)
downloadop-kernel-dev-3ae4cbadf4bf97ee137b921a1b928d2a5dcd26ca.zip
op-kernel-dev-3ae4cbadf4bf97ee137b921a1b928d2a5dcd26ca.tar.gz
exit_notify: don't take tasklist for TIF_SIGPENDING re-targeting
->siglock provides enough protection to iterate over the thread group. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/exit.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index b4d5696..28144b9 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -747,13 +747,11 @@ static void exit_notify(struct task_struct *tsk)
* Now we'll wake all the threads in the group just to make
* sure someone gets all the pending signals.
*/
- read_lock(&tasklist_lock);
spin_lock_irq(&tsk->sighand->siglock);
for (t = next_thread(tsk); t != tsk; t = next_thread(t))
if (!signal_pending(t) && !(t->flags & PF_EXITING))
recalc_sigpending_and_wake(t);
spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
}
write_lock_irq(&tasklist_lock);
@@ -781,9 +779,8 @@ static void exit_notify(struct task_struct *tsk)
* and we were the only connection outside, so our pgrp
* is about to become orphaned.
*/
-
t = tsk->real_parent;
-
+
pgrp = task_pgrp(tsk);
if ((task_pgrp(t) != pgrp) &&
(task_session(t) == task_session(tsk)) &&
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