linux-kernel - [PATCH 13/41] microblaze: No need to reset handler if SA

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Message-Id: <1313071035-12047-14-git-send-email-matt@console-pimps.org>
Date:	Thu, 11 Aug 2011 14:56:47 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Michal Simek <monstr@...str.eu>
Subject: [PATCH 13/41] microblaze: No need to reset handler if SA_ONESHOT

From: Matt Fleming <matt.fleming@...el.com>

get_signal_to_deliver() already resets the signal handler if
SA_ONESHOT is set in ka->sa.sa_flags, there's no need to do it again
in handle_signal(). Furthermore, because we were modifying
ka->sa.sa_handler without holding ->sighand->siglock there's the
potential we can race with another thread if it modifies the signal
handlers.

Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Michal Simek <monstr@...str.eu>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
---
 arch/microblaze/kernel/signal.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index 90de06d..9e749c0 100644
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -320,9 +320,6 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
 	else
 		setup_rt_frame(sig, ka, NULL, oldset, regs);
 
-	if (ka->sa.sa_flags & SA_ONESHOT)
-		ka->sa.sa_handler = SIG_DFL;
-
 	if (!(ka->sa.sa_flags & SA_NODEFER)) {
 		spin_lock_irq(&current->sighand->siglock);
 		sigorsets(&current->blocked,
-- 
1.7.4.4

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