Index: sys/dev/mrsas/mrsas_fp.c
===================================================================
--- sys/dev/mrsas/mrsas_fp.c
+++ sys/dev/mrsas/mrsas_fp.c
@@ -974,7 +974,8 @@
 			raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))
 			pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 		else if (raid->level == 1) {
-			pd = MR_ArPdGet(arRef, physArm + 1, map);
+			physArm = physArm + 1;
+			pd = MR_ArPdGet(arRef, physArm, map);
 			if (pd != MR_PD_INVALID) {
 				*pDevHandle = MR_PdDevHandleGet(pd, map);
 				*pPdInterface = MR_PdInterfaceTypeGet(pd, map);
@@ -1719,7 +1720,8 @@
 			pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 		else if (raid->level == 1) {
 			/* Get Alternate Pd. */
-			pd = MR_ArPdGet(arRef, physArm + 1, map);
+			physArm = physArm + 1;
+			pd = MR_ArPdGet(arRef, physArm, map);
 			if (pd != MR_PD_INVALID) {
 				/* Get dev handle from Pd. */
 				*pDevHandle = MR_PdDevHandleGet(pd, map);