[PATCH 14/40] m68k: Use set_current_blocked() and block_sigmask()

[Matt Fleming <matt@xxxxxxxxxxxxxxxxx>]

From: Matt Fleming <matt.fleming@xxxxxxxxx>

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@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Acked-by: Greg Ungerer <gerg@xxxxxxxxxxx>
CC: linux-m68k@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
---
 arch/m68k/kernel/signal_mm.c |   22 +++++++++-------------
 arch/m68k/kernel/signal_no.c |   28 +++++++++-------------------
 2 files changed, 18 insertions(+), 32 deletions(-)

diff --git a/arch/m68k/kernel/signal_mm.c b/arch/m68k/kernel/signal_mm.c
index cb856f9..93208b8 100644
--- a/arch/m68k/kernel/signal_mm.c
+++ b/arch/m68k/kernel/signal_mm.c
@@ -105,12 +105,13 @@ int handle_kernel_fault(struct pt_regs *regs)
 asmlinkage int
 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
 {
-	mask &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
+	sigset_t blocked;
+
 	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, mask);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+
+	mask &= _BLOCKABLE;
+	siginitset(&blocked, mask);
+	set_current_blocked(&blocked);
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
@@ -528,8 +529,7 @@ asmlinkage int do_sigreturn(unsigned long __unused)
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	current->blocked = set;
-	recalc_sigpending();
+	set_current_blocked(&set);
 
 	if (restore_sigcontext(regs, &frame->sc, frame + 1))
 		goto badframe;
@@ -554,8 +554,7 @@ asmlinkage int do_rt_sigreturn(unsigned long __unused)
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	current->blocked = set;
-	recalc_sigpending();
+	set_current_blocked(&set);
 
 	if (rt_restore_ucontext(regs, sw, &frame->uc))
 		goto badframe;
@@ -1063,10 +1062,7 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
 	if (err)
 		return;
 
-	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
-	if (!(ka->sa.sa_flags & SA_NODEFER))
-		sigaddset(&current->blocked,sig);
-	recalc_sigpending();
+	block_sigmask(ka, sig);
 
 	if (test_thread_flag(TIF_DELAYED_TRACE)) {
 		regs->sr &= ~0x8000;
diff --git a/arch/m68k/kernel/signal_no.c b/arch/m68k/kernel/signal_no.c
index 36a81bb..33e8bf5 100644
--- a/arch/m68k/kernel/signal_no.c
+++ b/arch/m68k/kernel/signal_no.c
@@ -60,12 +60,13 @@ void ret_from_user_rt_signal(void);
 asmlinkage int
 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
 {
-	mask &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
+	sigset_t blocked;
+
 	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, mask);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+
+	mask &= _BLOCKABLE;
+	siginitset(&blocked, mask);
+	set_current_blocked(&blocked);
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
@@ -343,10 +344,7 @@ asmlinkage int do_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 (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
 		goto badframe;
@@ -372,10 +370,7 @@ 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_ucontext(regs, sw, &frame->uc, &d0))
 		goto badframe;
@@ -708,12 +703,7 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
 	if (err)
 		return;
 
-	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);
+	block_sigmask(ka, sig);
 
 	clear_thread_flag(TIF_RESTORE_SIGMASK);
 }
-- 
1.7.4.4

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