[PATCH v2 3/3] scsi: libsas: Simplify sas_check_parent_topology()

[Jason Yan <yanaijie@xxxxxxxxxx>]

Factor out a new helper sas_check_phy_topology() to simplify
sas_check_parent_topology(). And centralize the calling of
sas_print_parent_topology_bug().

Signed-off-by: Jason Yan <yanaijie@xxxxxxxxxx>
---
 drivers/scsi/libsas/sas_expander.c | 94 +++++++++++++++++-------------
 1 file changed, 54 insertions(+), 40 deletions(-)

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index bbf73e74530e..be8171f39de3 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1239,11 +1239,58 @@ static int sas_check_eeds(struct domain_device *child,
 	return res;
 }
 
-/* Here we spill over 80 columns.  It is intentional.
- */
-static int sas_check_parent_topology(struct domain_device *child)
+static int sas_check_phy_topology(struct domain_device *child,
+				  struct ex_phy *parent_phy)
 {
 	struct expander_device *child_ex = &child->ex_dev;
+	struct ex_phy *child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
+	struct expander_device *parent_ex = &child->parent->ex_dev;
+	bool print_topology_bug = false;
+	int res = 0;
+
+	switch (child->parent->dev_type) {
+	case SAS_EDGE_EXPANDER_DEVICE:
+		if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
+			if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
+				child_phy->routing_attr != TABLE_ROUTING) {
+				res = -ENODEV;
+				print_topology_bug = true;
+			}
+		} else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
+			if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
+				res = sas_check_eeds(child, parent_phy, child_phy);
+			} else if (child_phy->routing_attr != TABLE_ROUTING) {
+				res = -ENODEV;
+				print_topology_bug = true;
+			}
+		} else if (parent_phy->routing_attr == TABLE_ROUTING) {
+			if (child_phy->routing_attr != SUBTRACTIVE_ROUTING &&
+			    (child_phy->routing_attr != TABLE_ROUTING ||
+			    !child_ex->t2t_supp || !parent_ex->t2t_supp)) {
+				res = -ENODEV;
+				print_topology_bug = true;
+			}
+		}
+		break;
+	case SAS_FANOUT_EXPANDER_DEVICE:
+		if (parent_phy->routing_attr != TABLE_ROUTING ||
+		    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
+			res = -ENODEV;
+			print_topology_bug = true;
+		}
+		break;
+	default:
+		break;
+	}
+
+	if (print_topology_bug)
+		sas_print_parent_topology_bug(child, parent_phy, child_phy);
+
+	return res;
+}
+
+static int sas_check_parent_topology(struct domain_device *child)
+{
 	struct expander_device *parent_ex;
 	int i;
 	int res = 0;
@@ -1258,7 +1305,7 @@ static int sas_check_parent_topology(struct domain_device *child)
 
 	for (i = 0; i < parent_ex->num_phys; i++) {
 		struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
-		struct ex_phy *child_phy;
+		int ret;
 
 		if (parent_phy->phy_state == PHY_VACANT ||
 		    parent_phy->phy_state == PHY_NOT_PRESENT)
@@ -1267,42 +1314,9 @@ static int sas_check_parent_topology(struct domain_device *child)
 		if (!sas_phy_match_dev_addr(child, parent_phy))
 			continue;
 
-		child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
-
-		switch (child->parent->dev_type) {
-		case SAS_EDGE_EXPANDER_DEVICE:
-			if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
-				if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
-				    child_phy->routing_attr != TABLE_ROUTING) {
-					sas_print_parent_topology_bug(child, parent_phy, child_phy);
-					res = -ENODEV;
-				}
-			} else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
-				if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
-					res = sas_check_eeds(child, parent_phy, child_phy);
-				} else if (child_phy->routing_attr != TABLE_ROUTING) {
-					sas_print_parent_topology_bug(child, parent_phy, child_phy);
-					res = -ENODEV;
-				}
-			} else if (parent_phy->routing_attr == TABLE_ROUTING) {
-				if (child_phy->routing_attr != SUBTRACTIVE_ROUTING &&
-				    (child_phy->routing_attr != TABLE_ROUTING ||
-				     !child_ex->t2t_supp || !parent_ex->t2t_supp)) {
-					sas_print_parent_topology_bug(child, parent_phy, child_phy);
-					res = -ENODEV;
-				}
-			}
-			break;
-		case SAS_FANOUT_EXPANDER_DEVICE:
-			if (parent_phy->routing_attr != TABLE_ROUTING ||
-			    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
-				sas_print_parent_topology_bug(child, parent_phy, child_phy);
-				res = -ENODEV;
-			}
-			break;
-		default:
-			break;
-		}
+		ret = sas_check_phy_topology(child, parent_phy);
+		if (ret)
+			res = ret;
 	}
 
 	return res;
-- 
2.31.1