[PATCH 34/41] xtensa: No need to reset handler if SA_ONESHOT

From: Matt Fleming
Date: Thu Aug 11 2011 - 09:59:51 EST

From: Matt Fleming <matt.fleming@xxxxxxxxx>

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

Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
arch/xtensa/kernel/signal.c | 3 ---
1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index 4f53770..24655e3 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -536,9 +536,6 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
/* Set up the stack frame */
setup_frame(signr, &ka, &info, oldset, regs);

- if (ka.sa.sa_flags & SA_ONESHOT)
- ka.sa.sa_handler = SIG_DFL;
sigorsets(&current->blocked, &current->blocked, &ka.sa.sa_mask);
if (!(ka.sa.sa_flags & SA_NODEFER))

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