1 files changed, 29 insertions, 4 deletions

diff --git a/arch/sh64/kernel/signal.c b/arch/sh64/kernel/signal.c
index b76bdfa473d6..c8525ade0564 100644
--- a/arch/sh64/kernel/signal.c
+++ b/arch/sh64/kernel/signal.c
@@ -698,7 +698,9 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
         if (try_to_freeze())
                 goto no_signal;
 
-        if (!oldset)
+        if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                oldset = &current->saved_sigmask;
+        else if (!oldset)
                 oldset = &current->blocked;
 
         signr = get_signal_to_deliver(&info, &ka, regs, 0);
@@ -706,6 +708,15 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
         if (signr > 0) {
                 /* Whee!  Actually deliver the signal.  */
                 handle_signal(signr, &info, &ka, oldset, regs);
+
+                /*
+                 * If a signal was successfully delivered, the saved sigmask
+                 * is in its frame, and we can clear the TIF_RESTORE_SIGMASK
+                 * flag.
+                 */
+                if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                        clear_thread_flag(TIF_RESTORE_SIGMASK);
+
                 return 1;
         }
 
@@ -713,13 +724,27 @@ no_signal:
         /* Did we come from a system call? */
         if (regs->syscall_nr >= 0) {
                 /* Restart the system call - no handlers present */
-                if (regs->regs[REG_RET] == -ERESTARTNOHAND ||
-                    regs->regs[REG_RET] == -ERESTARTSYS ||
-                    regs->regs[REG_RET] == -ERESTARTNOINTR) {
+                switch (regs->regs[REG_RET]) {
+                case -ERESTARTNOHAND:
+                case -ERESTARTSYS:
+                case -ERESTARTNOINTR:
                         /* Decode Syscall # */
                         regs->regs[REG_RET] = regs->syscall_nr;
                         regs->pc -= 4;
+                        break;
+
+                case -ERESTART_RESTARTBLOCK:
+                        regs->regs[REG_RET] = __NR_restart_syscall;
+                        regs->pc -= 4;
+                        break;
                 }
         }
+
+        /* No signal to deliver -- put the saved sigmask back */
+        if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+                clear_thread_flag(TIF_RESTORE_SIGMASK);
+                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+        }
+
         return 0;
 }