linux-kernel - [PATCH 06/40] blackfin: Use set_current_blocked() and block

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Date:	Tue, 14 Feb 2012 11:40:39 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	linux-arch@...r.kernel.org
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Matt Fleming <matt.fleming@...el.com>,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: [PATCH 06/40] blackfin: Use set_current_blocked() and block_sigmask()

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

As described in e6fa16ab ("signal: sigprocmask() should do
retarget_shared_pending()") the modification of current->blocked is
incorrect as we need to check whether the signal we're about to block
is pending in the shared queue.

Also, use the new helper function introduced in commit 5e6292c0f28f
("signal: add block_sigmask() for adding sigmask to current->blocked")
which centralises the code for updating current->blocked after
successfully delivering a signal and reduces the amount of duplicate
code across architectures. In the past some architectures got this
code wrong, so using this helper function should stop that from
happening again.

Cc: Oleg Nesterov <oleg@...hat.com>
Acked-by: Mike Frysinger <vapier@...too.org>
Cc: uclinux-dist-devel@...ckfin.uclinux.org
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
---
 arch/blackfin/kernel/signal.c |   17 ++++-------------
 1 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c
index d536f35..05ece02 100644
--- a/arch/blackfin/kernel/signal.c
+++ b/arch/blackfin/kernel/signal.c
@@ -99,10 +99,7 @@ asmlinkage int do_rt_sigreturn(unsigned long __unused)
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 
 	if (rt_restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
 		goto badframe;
@@ -266,15 +263,9 @@ handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
 	/* set up the stack frame */
 	ret = setup_rt_frame(sig, ka, info, oldset, regs);
 
-	if (ret == 0) {
-		spin_lock_irq(&current->sighand->siglock);
-		sigorsets(&current->blocked, &current->blocked,
-			  &ka->sa.sa_mask);
-		if (!(ka->sa.sa_flags & SA_NODEFER))
-			sigaddset(&current->blocked, sig);
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
-	}
+	if (ret == 0)
+		block_sigmask(ka, sig);
+
 	return ret;
 }
 
-- 
1.7.4.4

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