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Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/vm86_32.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index b466cab5ba15..328cb37bb827 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -172,6 +172,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
spinlock_t *ptl;
int i;
+ down_write(&mm->mmap_sem);
pgd = pgd_offset(mm, 0xA0000);
if (pgd_none_or_clear_bad(pgd))
goto out;
@@ -190,6 +191,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
}
pte_unmap_unlock(pte, ptl);
out:
+ up_write(&mm->mmap_sem);
flush_tlb();
}