diff --git a/block/blk-core.c b/block/blk-core.c
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -367,10 +367,8 @@
 	queue_flag_set_unlocked(QUEUE_FLAG_DEAD, q);
 	mutex_unlock(&q->sysfs_lock);
 
-	if (q->elevator)
-		elevator_exit(q->elevator);
-
-	blk_throtl_exit(q);
+        if (q->queue_lock != &q->__queue_lock)
+                q->queue_lock = &q->__queue_lock;
 
 	blk_put_queue(q);
 }
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -472,6 +472,11 @@
 
 	blk_sync_queue(q);
 
+        if (q->elevator)
+                elevator_exit(q->elevator);
+
+        blk_throtl_exit(q);
+
 	if (rl->rq_pool)
 		mempool_destroy(rl->rq_pool);
 
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ee2f74a..48cb615 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -414,6 +414,22 @@ static void save_error_info(struct super_block *sb, const char *func,
 	ext4_commit_super(sb, 1);
 }
 
+/*
+ * The del_gendisk() function deactivates the inode and deactivates
+ * the bdi without telling the file system.  Once this happens, any
+ * attempt to call mark_buffer_dirty() (for example, by
+ * ext4_commit_super), will cause a kernel OOPS.  This is a kludge to
+ * prevent these oops until we can put in a proper hook in
+ * del_gendisk() to inform the VFS and file system layers.
+ */
+static int block_device_ejected(struct super_block *sb)
+{
+	struct inode *bd_inode = sb->s_bdev->bd_inode;
+	struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
+
+	return bdi->dev == NULL;
+}
+
 
 /* Deal with the reporting of failure conditions on a filesystem such as
  * inconsistencies detected or read IO failures.
@@ -4072,7 +4088,7 @@ static int ext4_commit_super(struct super_block *sb, int sync)
 	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
 	int error = 0;
 
-	if (!sbh)
+	if (!sbh || block_device_ejected(sb))
 		return error;
 	if (buffer_write_io_error(sbh)) {
 		/*