[PATCH] sigio: cleanup, don't take tasklist twice

The only user of send_sigio_to_task() already holds tasklist_lock, so it is
better not to send the signal via send_group_sig_info() (which takes
tasklist recursively) but use group_send_sig_info().

The same change in send_sigurg()->send_sigurg_to_task().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/fcntl.c

@@ -457,11 +457,11 @@ static void send_sigio_to_task(struct task_struct *p,
 			else
 				si.si_band = band_table[reason - POLL_IN];
 			si.si_fd    = fd;
-			if (!send_group_sig_info(fown->signum, &si, p))
+			if (!group_send_sig_info(fown->signum, &si, p))
 				break;
 		/* fall-through: fall back on the old plain SIGIO signal */
 		case 0:
-			send_group_sig_info(SIGIO, SEND_SIG_PRIV, p);
+			group_send_sig_info(SIGIO, SEND_SIG_PRIV, p);
 	}
 }
 
@@ -495,7 +495,7 @@ static void send_sigurg_to_task(struct task_struct *p,
                                 struct fown_struct *fown)
 {
 	if (sigio_perm(p, fown, SIGURG))
-		send_group_sig_info(SIGURG, SEND_SIG_PRIV, p);
+		group_send_sig_info(SIGURG, SEND_SIG_PRIV, p);
 }
 
 int send_sigurg(struct fown_struct *fown)