[PATCH] uml: TT mode softint fixes

Some fixes to make softints work in tt mode.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/um/kernel/tt/trap_user.c b/arch/um/kernel/tt/trap_user.c
index a414c529fbcd..b5d9d64d91e4 100644
--- a/arch/um/kernel/tt/trap_user.c
+++ b/arch/um/kernel/tt/trap_user.c
@@ -18,7 +18,7 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
 {
         struct sigcontext *sc = sc_ptr;
         struct tt_regs save_regs, *r;
-        int save_errno = errno, is_user;
+        int save_errno = errno, is_user = 0;
         void (*handler)(int, union uml_pt_regs *);
 
         /* This is done because to allow SIGSEGV to be delivered inside a SEGV
@@ -35,7 +35,8 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
                 GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
         }
         save_regs = *r;
-        is_user = user_context(SC_SP(sc));
+        if (sc)
+                is_user = user_context(SC_SP(sc));
         r->sc = sc;
         if(sig != SIGUSR2) 
                 r->syscall = -1;