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Commit d1d81c01 authored by Mike Christie's avatar Mike Christie Committed by James Bottomley
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[SCSI] iscsi_tcp: remove DMA alignment restriction 



Add a slave_configure function to iSCSI TCP to remove any DMA
alignment restriction.  This permits the use of direct IO from
arbitrary addresses.

Signed-off-by: default avatarPete Wyckoff <pw@osc.edu>
Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent dbdb016d

drivers/scsi/iscsi_tcp.c

+8 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 
#include <linux/scatterlist.h>

#include <net/tcp.h>

#include <scsi/scsi_cmnd.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_host.h>

#include <scsi/scsi.h>

#include <scsi/scsi_transport_iscsi.h>
@@ -2184,6 +2185,12 @@ static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) 
	iscsi_session_teardown(cls_session);

}



static int iscsi_tcp_slave_configure(struct scsi_device *sdev)

{

	blk_queue_dma_alignment(sdev->request_queue, 0);

	return 0;

}



static struct scsi_host_template iscsi_sht = {

	.name			= "iSCSI Initiator over TCP/IP",

	.queuecommand           = iscsi_queuecommand,
@@ -2195,6 +2202,7 @@ static struct scsi_host_template iscsi_sht = { 
	.eh_abort_handler       = iscsi_eh_abort,

	.eh_host_reset_handler	= iscsi_eh_host_reset,

	.use_clustering         = DISABLE_CLUSTERING,

	.slave_configure        = iscsi_tcp_slave_configure,

	.proc_name		= "iscsi_tcp",

	.this_id		= -1,

};