unicore32: Use set_current_blocked()

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.

Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>

arch/unicore32/kernel/signal.c

@@ -63,10 +63,7 @@ static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
 	err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
 	if (err == 0) {
 		sigdelsetmask(&set, ~_BLOCKABLE);
-		spin_lock_irq(&current->sighand->siglock);
-		current->blocked = set;
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
+		set_current_blocked(&set);
 	}
 
 	err |= __get_user(regs->UCreg_00, &sf->uc.uc_mcontext.regs.UCreg_00);
@@ -321,6 +318,7 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka,
 {
 	struct thread_info *thread = current_thread_info();
 	struct task_struct *tsk = current;
+	sigset_t blocked;
 	int usig = sig;
 	int ret;
 
@@ -372,13 +370,10 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka,
 	/*
 	 * Block the signal if we were successful.
 	 */
-	spin_lock_irq(&tsk->sighand->siglock);
-	sigorsets(&tsk->blocked, &tsk->blocked,
-		  &ka->sa.sa_mask);
+	sigorsets(&blocked, &tsk->blocked, &ka->sa.sa_mask);
 	if (!(ka->sa.sa_flags & SA_NODEFER))
-		sigaddset(&tsk->blocked, sig);
-	recalc_sigpending();
-	spin_unlock_irq(&tsk->sighand->siglock);
+		sigaddset(&blocked, sig);
+	set_current_blocked(&blocked);
 
 	return 0;
 }