sh: Handle a NULL vma in __update_tlb() for the fast-path.

The TLB miss fast-path presently calls in to update_mmu_cache() to
set up the entry, and does so with a NULL vma. Check for vma validity
in the __update_tlb() ptrace checks.

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

3 files changed, 3 insertions, 3 deletions

diff --git a/arch/sh/mm/tlb-pteaex.c b/arch/sh/mm/tlb-pteaex.c
index 9aabd313cede..409b7c2b4b9d 100644
--- a/arch/sh/mm/tlb-pteaex.c
+++ b/arch/sh/mm/tlb-pteaex.c
@@ -23,7 +23,7 @@ void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
         /*
          * Handle debugger faulting in for debugee.
          */
-        if (current->active_mm != vma->vm_mm)
+        if (vma && current->active_mm != vma->vm_mm)
                 return;
 
         local_irq_save(flags);
diff --git a/arch/sh/mm/tlb-sh3.c b/arch/sh/mm/tlb-sh3.c
index 425f1f23cf93..ace8e6d2f59d 100644
--- a/arch/sh/mm/tlb-sh3.c
+++ b/arch/sh/mm/tlb-sh3.c
@@ -34,7 +34,7 @@ void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
         /*
          * Handle debugger faulting in for debugee.
          */
-        if (current->active_mm != vma->vm_mm)
+        if (vma && current->active_mm != vma->vm_mm)
                 return;
 
         local_irq_save(flags);
diff --git a/arch/sh/mm/tlb-sh4.c b/arch/sh/mm/tlb-sh4.c
index 81199f1e5945..7d3c63e707a5 100644
--- a/arch/sh/mm/tlb-sh4.c
+++ b/arch/sh/mm/tlb-sh4.c
@@ -22,7 +22,7 @@ void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
         /*
          * Handle debugger faulting in for debugee.
          */
-        if (current->active_mm != vma->vm_mm)
+        if (vma && current->active_mm != vma->vm_mm)
                 return;
 
         local_irq_save(flags);