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Commit d850bd34 authored by Pavel Machek's avatar Pavel Machek Committed by James Bottomley
Browse files

[SCSI] Small cleanups for scsi_host.h 



Small cleanups in scsi_host.h. Few #defines make me wonder if their
description is still up to date..?

Signed-off-by: default avatarPavel Machek <pavel@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent 8144f213

include/scsi/scsi_host.h

+25 −19
Original line number Diff line number Diff line
@@ -280,39 +280,45 @@ struct scsi_host_template { 
	 * If the host wants to be called before the scan starts, but

	 * after the midlayer has set up ready for the scan, it can fill

	 * in this function.

	 *

	 * Status: OPTIONAL

	 */

	void (* scan_start)(struct Scsi_Host *);



	/*

	 * fill in this function to allow the queue depth of this host

	 * to be changeable (on a per device basis).  returns either

	 * Fill in this function to allow the queue depth of this host

	 * to be changeable (on a per device basis).  Returns either

	 * the current queue depth setting (may be different from what

	 * was passed in) or an error.  An error should only be

	 * returned if the requested depth is legal but the driver was

	 * unable to set it.  If the requested depth is illegal, the

	 * driver should set and return the closest legal queue depth.

	 *

	 * Status: OPTIONAL

	 */

	int (* change_queue_depth)(struct scsi_device *, int);



	/*

	 * fill in this function to allow the changing of tag types

	 * Fill in this function to allow the changing of tag types

	 * (this also allows the enabling/disabling of tag command

	 * queueing).  An error should only be returned if something

	 * went wrong in the driver while trying to set the tag type.

	 * If the driver doesn't support the requested tag type, then

	 * it should set the closest type it does support without

	 * returning an error.  Returns the actual tag type set.

	 *

	 * Status: OPTIONAL

	 */

	int (* change_queue_type)(struct scsi_device *, int);



	/*

	 * This function determines the bios parameters for a given

	 * This function determines the BIOS parameters for a given

	 * harddisk.  These tend to be numbers that are made up by

	 * the host adapter.  Parameters:

	 * size, device, list (heads, sectors, cylinders)

	 *

	 * Status: OPTIONAL */

	 * Status: OPTIONAL

	 */

	int (* bios_param)(struct scsi_device *, struct block_device *,

			sector_t, int []);
@@ -351,7 +357,7 @@ struct scsi_host_template { 


	/*

	 * This determines if we will use a non-interrupt driven

	 * or an interrupt driven scheme,  It is set to the maximum number

	 * or an interrupt driven scheme.  It is set to the maximum number

	 * of simultaneous commands a given host adapter will accept.

	 */

	int can_queue;
@@ -372,12 +378,12 @@ struct scsi_host_template { 
	unsigned short sg_tablesize;



	/*

	 * If the host adapter has limitations beside segment count

	 * Set this if the host adapter has limitations beside segment count.

	 */

	unsigned short max_sectors;



	/*

	 * dma scatter gather segment boundary limit. a segment crossing this

	 * DMA scatter gather segment boundary limit. A segment crossing this

	 * boundary will be split in two.

	 */

	unsigned long dma_boundary;
@@ -386,7 +392,7 @@ struct scsi_host_template { 
	 * This specifies "machine infinity" for host templates which don't

	 * limit the transfer size.  Note this limit represents an absolute

	 * maximum, and may be over the transfer limits allowed for

	 * individual devices (e.g. 256 for SCSI-1)

	 * individual devices (e.g. 256 for SCSI-1).

	 */

#define SCSI_DEFAULT_MAX_SECTORS	1024
@@ -413,12 +419,12 @@ struct scsi_host_template { 
	unsigned supported_mode:2;



	/*

	 * true if this host adapter uses unchecked DMA onto an ISA bus.

	 * True if this host adapter uses unchecked DMA onto an ISA bus.

	 */

	unsigned unchecked_isa_dma:1;



	/*

	 * true if this host adapter can make good use of clustering.

	 * True if this host adapter can make good use of clustering.

	 * I originally thought that if the tablesize was large that it

	 * was a waste of CPU cycles to prepare a cluster list, but

	 * it works out that the Buslogic is faster if you use a smaller
@@ -428,7 +434,7 @@ struct scsi_host_template { 
	unsigned use_clustering:1;



	/*

	 * True for emulated SCSI host adapters (e.g. ATAPI)

	 * True for emulated SCSI host adapters (e.g. ATAPI).

	 */

	unsigned emulated:1;
@@ -438,12 +444,12 @@ struct scsi_host_template { 
	unsigned skip_settle_delay:1;



	/*

	 * ordered write support

	 * True if we are using ordered write support.

	 */

	unsigned ordered_tag:1;



	/*

	 * Countdown for host blocking with no commands outstanding

	 * Countdown for host blocking with no commands outstanding.

	 */

	unsigned int max_host_blocked;
@@ -522,8 +528,8 @@ struct Scsi_Host { 
	struct scsi_transport_template *transportt;



	/*

	 * area to keep a shared tag map (if needed, will be

	 * NULL if not)

	 * Area to keep a shared tag map (if needed, will be

	 * NULL if not).

	 */

	struct blk_queue_tag	*bqt;
@@ -596,16 +602,16 @@ struct Scsi_Host { 
	/*

	 * Host uses correct SCSI ordering not PC ordering. The bit is

	 * set for the minority of drivers whose authors actually read

	 * the spec ;)

	 * the spec ;).

	 */

	unsigned reverse_ordering:1;



	/*

	 * ordered write support

	 * Ordered write support

	 */

	unsigned ordered_tag:1;



	/* task mgmt function in progress */

	/* Task mgmt function in progress */

	unsigned tmf_in_progress:1;



	/* Asynchronous scan in progress */