[PATCH] signals: send_signal: be paranoid about signalfd_notify()

[Oleg Nesterov <oleg@tv-sign.ru>]

send_signal() shouldn't call signalfd_notify() if it then fails with -EAGAIN.
Harmless, just a paranoid cleanup.

Also remove the comment. It is obsolete, signalfd_notify() was simplified and
does a simple wakeup.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- 25/kernel/signal.c~3_SS_NOTIFY	2008-03-12 15:16:52.000000000 +0300
+++ 25/kernel/signal.c	2008-03-12 15:55:47.000000000 +0300
@@ -769,13 +769,6 @@ static int send_signal(int sig, struct s
 	 */
 	if (legacy_queue(pending, sig))
 		return 0;
-
-	/*
-	 * Deliver the signal to listening signalfds. This must be called
-	 * with the sighand lock held.
-	 */
-	signalfd_notify(t, sig);
-
 	/*
 	 * fast-pathed signals for kernel-internal things like SIGSTOP
 	 * or SIGKILL.
@@ -825,6 +818,7 @@ static int send_signal(int sig, struct s
 	}
 
 out_set:
+	signalfd_notify(t, sig);
 	sigaddset(&pending->signal, sig);
 	complete_signal(sig, t, group);
 	return 0;