3.1.0-rc4: oops at elv_put_request()

[Alexey Dobriyan]

Caught this one, there was no real load at the moment.
FWIW, setup is ext4 over RAID-6 across 4 disks.

	elv_put_request
	__blk_put_request
	blk_put_request
	scsi_execute
	scsi_execute_req
	scsi_test_unit_ready
	sd_check_events
	disk_events_workfn
	process_one_work
	worker_thread
	kthread
	kernel_thread_helper

$ addr2line -e vmlinux 0xffffffff811bcbbb
block/elevator.c:772

   768	void elv_put_request(struct request_queue *q, struct request *rq)
   769	{
   770		struct elevator_queue *e = q->elevator;
   771	
   772	===>	if (e->ops->elevator_put_req_fn)	<===
   773			e->ops->elevator_put_req_fn(rq);
   774	}
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