dm ioctl: use kmalloc if possible
[linux-3.10.git] / mm / mmu_notifier.c
index 479a1e7..8a5ac8c 100644 (file)
@@ -196,28 +196,28 @@ static int do_mmu_notifier_register(struct mmu_notifier *mn,
        BUG_ON(atomic_read(&mm->mm_users) <= 0);
 
        /*
-       * Verify that mmu_notifier_init() already run and the global srcu is
-       * initialized.
-       */
+        * Verify that mmu_notifier_init() already run and the global srcu is
+        * initialized.
+        */
        BUG_ON(!srcu.per_cpu_ref);
 
+       ret = -ENOMEM;
+       mmu_notifier_mm = kmalloc(sizeof(struct mmu_notifier_mm), GFP_KERNEL);
+       if (unlikely(!mmu_notifier_mm))
+               goto out;
+
        if (take_mmap_sem)
                down_write(&mm->mmap_sem);
        ret = mm_take_all_locks(mm);
        if (unlikely(ret))
-               goto out;
+               goto out_clean;
 
        if (!mm_has_notifiers(mm)) {
-               mmu_notifier_mm = kmalloc(sizeof(struct mmu_notifier_mm),
-                                       GFP_KERNEL);
-               if (unlikely(!mmu_notifier_mm)) {
-                       ret = -ENOMEM;
-                       goto out_of_mem;
-               }
                INIT_HLIST_HEAD(&mmu_notifier_mm->list);
                spin_lock_init(&mmu_notifier_mm->lock);
 
                mm->mmu_notifier_mm = mmu_notifier_mm;
+               mmu_notifier_mm = NULL;
        }
        atomic_inc(&mm->mm_count);
 
@@ -233,12 +233,12 @@ static int do_mmu_notifier_register(struct mmu_notifier *mn,
        hlist_add_head(&mn->hlist, &mm->mmu_notifier_mm->list);
        spin_unlock(&mm->mmu_notifier_mm->lock);
 
-out_of_mem:
        mm_drop_all_locks(mm);
-out:
+out_clean:
        if (take_mmap_sem)
                up_write(&mm->mmap_sem);
-
+       kfree(mmu_notifier_mm);
+out:
        BUG_ON(atomic_read(&mm->mm_users) <= 0);
        return ret;
 }