[PATCH 26/41] sh: No need to reset handler if SA_ONESHOT

Matt Fleming
2011-08-11T14:01:51Z

From: Matt Fleming <matt.fleming@intel.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@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
arch/sh/kernel/signal_32.c | 3 ---
arch/sh/kernel/signal_64.c | 3 ---
2 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index 579cd2c..7a00304 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -548,9 +548,6 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
else
ret = setup_frame(sig, ka, oldset, regs);

- if (ka->sa.sa_flags & SA_ONESHOT)
- ka->sa.sa_handler = SIG_DFL;
-
if (ret == 0) {
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c
index 5a9f1f1..c0e7d10 100644
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -738,9 +738,6 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
else
ret = setup_frame(sig, ka, oldset, regs);

- if (ka->sa.sa_flags & SA_ONESHOT)
- ka->sa.sa_handler = SIG_DFL;
-
if (ret == 0) {
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
--
1.7.4.4