diff options
| -rw-r--r-- | arch/arm/kernel/traps.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 57eb0f6f600..467b69ed102 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -418,12 +418,14 @@ static int bad_syscall(int n, struct pt_regs *regs) static inline void do_cache_op(unsigned long start, unsigned long end, int flags) { + struct mm_struct *mm = current->active_mm; struct vm_area_struct *vma; if (end < start || flags) return; - vma = find_vma(current->active_mm, start); + down_read(&mm->mmap_sem); + vma = find_vma(mm, start); if (vma && vma->vm_start < end) { if (start < vma->vm_start) start = vma->vm_start; @@ -432,6 +434,7 @@ do_cache_op(unsigned long start, unsigned long end, int flags) flush_cache_user_range(vma, start, end); } + up_read(&mm->mmap_sem); } /* |