sh: Handle -ERESTART_RESTARTBLOCK for restartable syscalls.

The current implementation only handles -ERESTARTNOHAND, whereas we
also need to handle -ERESTART_RESTARTBLOCK in the handle_signal()
case for restartable system calls.

As noted by Carl:

This fixes the LTP test nanosleep03 - the current kernel causes
-ERESTART_RESTARTBLOCK to reach user space rather than the correct
-EINTR.

Reported-by: Carl Shaw <shaw.carl@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/sh/kernel/signal.c b/arch/sh/kernel/signal.c
index fdca038e4b91..e323e299878b 100644
--- a/arch/sh/kernel/signal.c
+++ b/arch/sh/kernel/signal.c
@@ -268,7 +268,7 @@ asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
 badframe:
         force_sig(SIGSEGV, current);
         return 0;
-}       
+}
 
 /*
  * Set up a signal frame.
@@ -489,6 +489,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
         if (regs->tra >= 0) {
                 /* If so, check system call restarting.. */
                 switch (regs->regs[0]) {
+                        case -ERESTART_RESTARTBLOCK:
                         case -ERESTARTNOHAND:
                                 regs->regs[0] = -EINTR;
                                 break;
@@ -584,8 +585,8 @@ static void do_signal(struct pt_regs *regs, unsigned int save_r0)
         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
         if (signr > 0) {
                 /* Whee!  Actually deliver the signal.  */
-                if (handle_signal(signr, &ka, &info, oldset, regs, save_r0)
-                    == 0) {
+                if (handle_signal(signr, &ka, &info, oldset,
+                                  regs, save_r0) == 0) {
                         /* a signal was successfully delivered; the saved
                          * sigmask will have been stored in the signal frame,
                          * and will be restored by sigreturn, so we can simply