From: Mike Christie <michaelc@xxxxxxxxxxx>
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: Pete Wyckoff <pw@xxxxxxx>
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/iscsi_tcp.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 6eaa2e3..4e9f0d9 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -36,6 +36,7 @@ #include <linux/kfifo.h>
#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(st
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_s
.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,
};
--
1.4.1.1
-
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