m68knommu: fix syscall restarting

Make restart blocks working, required for proper syscall restarting.
Derived from same changes for m68k arch by Andreas Schwab <schwab@suse.de>

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/m68knommu/kernel/signal.c b/arch/m68knommu/kernel/signal.c
index bbfcae9e52b4..5ab6a04af14e 100644
--- a/arch/m68knommu/kernel/signal.c
+++ b/arch/m68knommu/kernel/signal.c
@@ -279,6 +279,9 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, void *fp,
         struct sigcontext context;
         int err = 0;
 
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
         /* get previous context */
         if (copy_from_user(&context, usc, sizeof(context)))
                 goto badframe;
@@ -316,6 +319,9 @@ rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
         unsigned long usp;
         int err;
 
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
         err = __get_user(temp, &uc->uc_mcontext.version);
         if (temp != MCONTEXT_VERSION)
                 goto badframe;
@@ -692,6 +698,15 @@ handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
                 regs->d0 = -EINTR;
                 break;
 
+        case -ERESTART_RESTARTBLOCK:
+                if (!has_handler) {
+                        regs->d0 = __NR_restart_syscall;
+                        regs->pc -= 2;
+                        break;
+                }
+                regs->d0 = -EINTR;
+                break;
+
         case -ERESTARTSYS:
                 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
                         regs->d0 = -EINTR;