commit 76e0a6f40b198f08fca69221c3d0112d1e9713a7
author Oleg Nesterov <oleg@redhat.com> Fri Jun 06 14:37:02 2014 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Fri Jun 06 16:08:12 2014 -0700
tree 94c9fd8483f34f6ba1ef88835fe876af16347ae2
parent b4e74264eb0b03f42097fa70a0766312156244a0

signals: change wait_for_helper() to use kernel_sigaction()

Now that we have kernel_sigaction() we can change wait_for_helper() to
use it and cleans up the code a bit.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kmod.c

diff --git a/kernel/kmod.c b/kernel/kmod.c
index 0ac67a5..8637e04 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -285,10 +285,7 @@
 	pid_t pid;
 
 	/* If SIGCLD is ignored sys_wait4 won't populate the status. */
-	spin_lock_irq(&current->sighand->siglock);
-	current->sighand->action[SIGCHLD-1].sa.sa_handler = SIG_DFL;
-	spin_unlock_irq(&current->sighand->siglock);
-
+	kernel_sigaction(SIGCHLD, SIG_DFL);
 	pid = kernel_thread(____call_usermodehelper, sub_info, SIGCHLD);
 	if (pid < 0) {
 		sub_info->retval = pid;