diff options
| author | Roland McGrath <roland@redhat.com> | 2007-05-23 13:57:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-23 20:14:12 -0700 |
| commit | 7bb44adef39ad3bda2be40bb34686bc56bd563a5 (patch) | |
| tree | 1e9eecbd03877c7ac8b00a8cb1d4ae54ebec3bb1 /kernel/exit.c | |
| parent | 3c6df2a9177c010bf811c361149069e4bfd9bb11 (diff) | |
| download | lwn-7bb44adef39ad3bda2be40bb34686bc56bd563a5.tar.gz lwn-7bb44adef39ad3bda2be40bb34686bc56bd563a5.zip | |
recalc_sigpending_tsk fixes
Steve Hawkes discovered a problem where recalc_sigpending_tsk was called in
do_sigaction but no signal_wake_up call was made, preventing later signals
from waking up blocked threads with TIF_SIGPENDING already set.
In fact, the few other calls to recalc_sigpending_tsk outside the signals
code are also subject to this problem in other race conditions.
This change makes recalc_sigpending_tsk private to the signals code. It
changes the outside calls, as well as do_sigaction, to use the new
recalc_sigpending_and_wake instead.
Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: <Steve.Hawkes@motorola.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 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index c6d14b8008dd..5b888c24e43e 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -762,11 +762,8 @@ static void exit_notify(struct task_struct *tsk) 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_tsk(t); - if (signal_pending(t)) - signal_wake_up(t, 0); - } + if (!signal_pending(t) && !(t->flags & PF_EXITING)) + recalc_sigpending_and_wake(t); spin_unlock_irq(&tsk->sighand->siglock); read_unlock(&tasklist_lock); } |