[POWERPC] Fix idr locking in init_new_context

We always need to serialize accesses to mmu_context_idr. I hit this bug when testing with a small number of mmu contexts. Signed-off-by: Sonny Rao <sonny@burdell.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
git-mirror · Jun 29, 2006 · f86c974 · f86c974
1 parent 975b365
commit f86c974
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/arch/powerpc/mm/mmu_context_64.c b/arch/powerpc/mm/mmu_context_64.c
@@ -44,7 +44,9 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 		return err;
 
 	if (index > MAX_CONTEXT) {
+		spin_lock(&mmu_context_lock);
 		idr_remove(&mmu_context_idr, index);
+		spin_unlock(&mmu_context_lock);
 		return -ENOMEM;
 	}