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>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/power/process.c b/kernel/power/process.c
index d31d638ab4c0..e0233d8422b9 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -101,7 +101,7 @@ static void cancel_freezing(struct task_struct *p)
                 pr_debug("  clean up: %s\n", p->comm);
                 do_not_freeze(p);
                 spin_lock_irqsave(&p->sighand->siglock, flags);
-                recalc_sigpending_tsk(p);
+                recalc_sigpending_and_wake(p);
                 spin_unlock_irqrestore(&p->sighand->siglock, flags);
         }
 }