[SCSI] qla4xxx: fix data alignment and use nl helpers

This has the driver use helpers for a common operation and fixes
a issue where if multiple iscsi params are sent they could be
sent at offsets that cause unaligned accesses. The nla helpers
account for the padding needed to align properly for the driver.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 13 insertions, 19 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index d39205c816d8..ce20dab75369 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -78,8 +78,8 @@ static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
 				  enum iscsi_param param, char *buf);
 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
 				  enum iscsi_host_param param, char *buf);
-static int qla4xxx_iface_set_param(struct Scsi_Host *shost, char *data,
-				   int count);
+static int qla4xxx_iface_set_param(struct Scsi_Host *shost, void *data,
+				   uint32_t len);
 static int qla4xxx_get_iface_param(struct iscsi_iface *iface,
 				   enum iscsi_param_type param_type,
 				   int param, char *buf);
@@ -842,7 +842,7 @@ qla4xxx_initcb_to_acb(struct addr_ctrl_blk *init_fw_cb)
 }
 
 static int
-qla4xxx_iface_set_param(struct Scsi_Host *shost, char *data, int count)
+qla4xxx_iface_set_param(struct Scsi_Host *shost, void *data, uint32_t len)
 {
 	struct scsi_qla_host *ha = to_qla_host(shost);
 	int rval = 0;
@@ -851,8 +851,8 @@ qla4xxx_iface_set_param(struct Scsi_Host *shost, char *data, int count)
 	dma_addr_t init_fw_cb_dma;
 	uint32_t mbox_cmd[MBOX_REG_COUNT];
 	uint32_t mbox_sts[MBOX_REG_COUNT];
-	uint32_t total_param_count;
-	uint32_t length;
+	uint32_t rem = len;
+	struct nlattr *attr;
 
 	init_fw_cb = dma_alloc_coherent(&ha->pdev->dev,
 					sizeof(struct addr_ctrl_blk),
@@ -873,11 +873,8 @@ qla4xxx_iface_set_param(struct Scsi_Host *shost, char *data, int count)
 		goto exit_init_fw_cb;
 	}
 
-	total_param_count = count;
-	iface_param = (struct iscsi_iface_param_info *)data;
-
-	for ( ; total_param_count != 0; total_param_count--) {
-		length = iface_param->len;
+	nla_for_each_attr(attr, data, len, rem) {
+		iface_param = nla_data(attr);
 
 		if (iface_param->param_type != ISCSI_NET_PARAM)
 			continue;
@@ -914,10 +911,6 @@ qla4xxx_iface_set_param(struct Scsi_Host *shost, char *data, int count)
 			ql4_printk(KERN_ERR, ha, "Invalid iface type\n");
 			break;
 		}
-
-		iface_param = (struct iscsi_iface_param_info *)
-						((uint8_t *)iface_param +
-			    sizeof(struct iscsi_iface_param_info) + length);
 	}
 
 	init_fw_cb->cookie = cpu_to_le32(0x11BEAD5A);
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 522423bdcb56..142a09a3afbf 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1890,7 +1890,7 @@ iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
 
 static int
 iscsi_set_iface_params(struct iscsi_transport *transport,
-		       struct iscsi_uevent *ev)
+		       struct iscsi_uevent *ev, uint32_t len)
 {
 	char *data = (char *)ev + sizeof(*ev);
 	struct Scsi_Host *shost;
@@ -1906,8 +1906,7 @@ iscsi_set_iface_params(struct iscsi_transport *transport,
 		return -ENODEV;
 	}
 
-	err = transport->set_iface_param(shost, data,
-					 ev->u.set_iface_params.count);
+	err = transport->set_iface_param(shost, data, len);
 	scsi_host_put(shost);
 	return err;
 }
@@ -2052,7 +2051,8 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
 		err = iscsi_set_path(transport, ev);
 		break;
 	case ISCSI_UEVENT_SET_IFACE_PARAMS:
-		err = iscsi_set_iface_params(transport, ev);
+		err = iscsi_set_iface_params(transport, ev,
+					     nlmsg_attrlen(nlh, sizeof(*ev)));
 		break;
 	default:
 		err = -ENOSYS;
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index a498ccecf6b1..5994bcc1b017 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -137,7 +137,8 @@ struct iscsi_transport {
 	int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
 			  uint32_t enable, struct sockaddr *dst_addr);
 	int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
-	int (*set_iface_param) (struct Scsi_Host *shost, char *data, int count);
+	int (*set_iface_param) (struct Scsi_Host *shost, void *data,
+				uint32_t len);
 	int (*get_iface_param) (struct iscsi_iface *iface,
 				enum iscsi_param_type param_type,
 				int param, char *buf);