[SCSI] qla2xxx: Cache swl during fabric discovery.

Rather than continuously allocating and freeing swl within the discovery
process, simply pre-allocate it the first time that it's needed, cache it
through the rest of the lifecycle of the driver and free it at module unload.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 8 insertions, 7 deletions

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 9d353ca4e1c7..649748ffbe79 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -2674,6 +2674,8 @@ struct qla_hw_data {
         void            *async_pd;
         dma_addr_t      async_pd_dma;
 
+        void            *swl;
+
         /* These are used by mailbox operations. */
         volatile uint16_t mailbox_out[MAILBOX_REGISTER_COUNT];
 
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index b28eb40d8adf..24b2d1118593 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -3133,20 +3133,21 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *vha,
         rval = QLA_SUCCESS;
 
         /* Try GID_PT to get device list, else GAN. */
-        swl = kcalloc(MAX_FIBRE_DEVICES, sizeof(sw_info_t), GFP_KERNEL);
+        if (!ha->swl)
+                ha->swl = kcalloc(MAX_FIBRE_DEVICES, sizeof(sw_info_t),
+                    GFP_KERNEL);
+        swl = ha->swl;
         if (!swl) {
                 /*EMPTY*/
                 ql_dbg(ql_dbg_disc, vha, 0x2054,
                     "GID_PT allocations failed, fallback on GA_NXT.\n");
         } else {
+                memset(swl, 0, MAX_FIBRE_DEVICES * sizeof(sw_info_t));
                 if (qla2x00_gid_pt(vha, swl) != QLA_SUCCESS) {
-                        kfree(swl);
                         swl = NULL;
                 } else if (qla2x00_gpn_id(vha, swl) != QLA_SUCCESS) {
-                        kfree(swl);
                         swl = NULL;
                 } else if (qla2x00_gnn_id(vha, swl) != QLA_SUCCESS) {
-                        kfree(swl);
                         swl = NULL;
                 } else if (ql2xiidmaenable &&
                     qla2x00_gfpn_id(vha, swl) == QLA_SUCCESS) {
@@ -3164,7 +3165,6 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *vha,
         if (new_fcport == NULL) {
                 ql_log(ql_log_warn, vha, 0x205e,
                     "Failed to allocate memory for fcport.\n");
-                kfree(swl);
                 return (QLA_MEMORY_ALLOC_FAILED);
         }
         new_fcport->flags |= (FCF_FABRIC_DEVICE | FCF_LOGIN_NEEDED);
@@ -3341,14 +3341,12 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *vha,
                 if (new_fcport == NULL) {
                         ql_log(ql_log_warn, vha, 0x2066,
                             "Memory allocation failed for fcport.\n");
-                        kfree(swl);
                         return (QLA_MEMORY_ALLOC_FAILED);
                 }
                 new_fcport->flags |= (FCF_FABRIC_DEVICE | FCF_LOGIN_NEEDED);
                 new_fcport->d_id.b24 = nxt_d_id.b24;
         }
 
-        kfree(swl);
         kfree(new_fcport);
 
         return (rval);
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index ffa3488eccae..94ff3a591471 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3280,6 +3280,7 @@ qla2x00_mem_free(struct qla_hw_data *ha)
         vfree(ha->optrom_buffer);
         kfree(ha->nvram);
         kfree(ha->npiv_info);
+        kfree(ha->swl);
 
         ha->srb_mempool = NULL;
         ha->ctx_mempool = NULL;