ieee1394: sbp2: update comment on things to do

 * driver. It also registers as a SCSI lower-level driver in order to accept

 * SCSI commands for transport using SBP-2.

 *

 * You may access any attached SBP-2 storage devices as if they were SCSI

 * devices (e.g. mount /dev/sda1,  fdisk, mkfs, etc.).

 * You may access any attached SBP-2 (usually storage devices) as regular

 * SCSI devices. E.g. mount /dev/sda1, fdisk, mkfs, etc..

 *

 * Current Issues:

 * See http://www.t10.org/drafts.htm#sbp2 for the final draft of the SBP-2

 * specification and for where to purchase the official standard.

 *

 *	- Error Handling: SCSI aborts and bus reset requests are handled somewhat

 *	  but the code needs additional debugging.

 * TODO:

 *   - look into possible improvements of the SCSI error handlers

 *   - handle Unit_Characteristics.mgt_ORB_timeout and .ORB_size

 *   - handle Logical_Unit_Number.ordered

 *   - handle src == 1 in status blocks

 *   - reimplement the DMA mapping in absence of physical DMA so that

 *     bus_to_virt is no longer required

 *   - debug the handling of absent physical DMA

 *   - replace CONFIG_IEEE1394_SBP2_PHYS_DMA by automatic detection

 *     (this is easy but depends on the previous two TODO items)

 *   - make the parameter serialize_io configurable per device

 *   - move all requests to fetch agent registers into non-atomic context,

 *     replace all usages of sbp2util_node_write_no_wait by true transactions

 *   - convert to generic DMA mapping API to eliminate dependency on PCI

 * Grep for inline FIXME comments below.

 */

#include <linux/blkdev.h>

 * Set serialize_io to 1 if you'd like only one scsi command sent

 * down to us at a time (debugging). This might be necessary for very

 * badly behaved sbp2 devices.

 *

 * TODO: Make this configurable per device.

 */

static int sbp2_serialize_io = 1;

module_param_named(serialize_io, sbp2_serialize_io, int, 0444);