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>
---
drivers/scsi/iscsi_tcp.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 4376840..f48eedd 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -2132,6 +2132,16 @@ static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
iscsi_session_teardown(cls_session);
}
+/*
+ * New device attached. Turn off the DMA alignment restriction on
+ * the request queue.
+ */
+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,
@@ -2142,6 +2152,7 @@ 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,
};
--
1.5.0.2
-
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