sh: Fix split ptlock for user mappings in __do_page_fault().

There was a bug that got introduced when the split ptlock changes
went in where mm could be unintialized for user mappings, this
fixes it up..

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index 7a03ffe6dadd..dc461d2bc183 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -210,10 +210,11 @@ asmlinkage int __do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
          * are always mapped, whether it be due to legacy behaviour in
          * 29-bit mode, or due to PMB configuration in 32-bit mode.
          */
-        if (address >= P3SEG && address < P3_ADDR_MAX)
+        if (address >= P3SEG && address < P3_ADDR_MAX) {
                 pgd = pgd_offset_k(address);
-        else {
-                if (unlikely(address >= TASK_SIZE || !current->mm))
+                mm = NULL;
+        } else {
+                if (unlikely(address >= TASK_SIZE || !(mm = current->mm)))
                         return 1;
 
                 pgd = pgd_offset(current->mm, address);