[SCSI] libfcoe: eliminate unused link and last_link fields

The link and last_link fields in the fcoe_ctlr struct are no
longer useful, since they are always set to the same value,
and FIP always calls libfc to pass link information to the lport.

Eliminate those fields and rename link_work to timer_work, since
it no longer has any link change work to do.

Thanks to Brian Uchino for discovering this issue.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 11 insertions, 29 deletions

diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
index 22f6e44fa737..b7718be3c096 100644
--- a/drivers/scsi/fcoe/libfcoe.c
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -51,7 +51,7 @@ MODULE_LICENSE("GPL v2");
 #define FCOE_CTLR_DEF_FKA       FIP_DEF_FKA     /* default keep alive (mS) */
 
 static void fcoe_ctlr_timeout(unsigned long);
-static void fcoe_ctlr_link_work(struct work_struct *);
+static void fcoe_ctlr_timer_work(struct work_struct *);
 static void fcoe_ctlr_recv_work(struct work_struct *);
 
 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
@@ -116,7 +116,7 @@ void fcoe_ctlr_init(struct fcoe_ctlr *fip)
         spin_lock_init(&fip->lock);
         fip->flogi_oxid = FC_XID_UNKNOWN;
         setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
-        INIT_WORK(&fip->link_work, fcoe_ctlr_link_work);
+        INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
         INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
         skb_queue_head_init(&fip->fip_recv_list);
 }
@@ -164,7 +164,7 @@ void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
         fcoe_ctlr_reset_fcfs(fip);
         spin_unlock_bh(&fip->lock);
         del_timer_sync(&fip->timer);
-        cancel_work_sync(&fip->link_work);
+        cancel_work_sync(&fip->timer_work);
 }
 EXPORT_SYMBOL(fcoe_ctlr_destroy);
 
@@ -257,14 +257,10 @@ void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
 {
         spin_lock_bh(&fip->lock);
         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
-                fip->last_link = 1;
-                fip->link = 1;
                 spin_unlock_bh(&fip->lock);
                 fc_linkup(fip->lp);
         } else if (fip->state == FIP_ST_LINK_WAIT) {
                 fip->state = fip->mode;
-                fip->last_link = 1;
-                fip->link = 1;
                 spin_unlock_bh(&fip->lock);
                 if (fip->state == FIP_ST_AUTO)
                         LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
@@ -306,9 +302,7 @@ int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
         LIBFCOE_FIP_DBG(fip, "link down.\n");
         spin_lock_bh(&fip->lock);
         fcoe_ctlr_reset(fip);
-        link_dropped = fip->link;
-        fip->link = 0;
-        fip->last_link = 0;
+        link_dropped = fip->state != FIP_ST_LINK_WAIT;
         fip->state = FIP_ST_LINK_WAIT;
         spin_unlock_bh(&fip->lock);
 
@@ -1175,7 +1169,7 @@ static void fcoe_ctlr_timeout(unsigned long arg)
                                "Starting FCF discovery.\n",
                                fip->lp->host->host_no);
                         fip->reset_req = 1;
-                        schedule_work(&fip->link_work);
+                        schedule_work(&fip->timer_work);
                 }
         }
 
@@ -1201,43 +1195,31 @@ static void fcoe_ctlr_timeout(unsigned long arg)
                 mod_timer(&fip->timer, next_timer);
         }
         if (fip->send_ctlr_ka || fip->send_port_ka)
-                schedule_work(&fip->link_work);
+                schedule_work(&fip->timer_work);
         spin_unlock_bh(&fip->lock);
 }
 
 /**
- * fcoe_ctlr_link_work() - Worker thread function for link changes
+ * fcoe_ctlr_timer_work() - Worker thread function for timer work
  * @work: Handle to a FCoE controller
  *
- * See if the link status has changed and if so, report it.
- *
- * This is here because fc_linkup() and fc_linkdown() must not
+ * Sends keep-alives and resets which must not
  * be called from the timer directly, since they use a mutex.
  */
-static void fcoe_ctlr_link_work(struct work_struct *work)
+static void fcoe_ctlr_timer_work(struct work_struct *work)
 {
         struct fcoe_ctlr *fip;
         struct fc_lport *vport;
         u8 *mac;
-        int link;
-        int last_link;
         int reset;
 
-        fip = container_of(work, struct fcoe_ctlr, link_work);
+        fip = container_of(work, struct fcoe_ctlr, timer_work);
         spin_lock_bh(&fip->lock);
-        last_link = fip->last_link;
-        link = fip->link;
-        fip->last_link = link;
         reset = fip->reset_req;
         fip->reset_req = 0;
         spin_unlock_bh(&fip->lock);
 
-        if (last_link != link) {
-                if (link)
-                        fc_linkup(fip->lp);
-                else
-                        fc_linkdown(fip->lp);
-        } else if (reset && link)
+        if (reset)
                 fc_lport_reset(fip->lp);
 
         if (fip->send_ctlr_ka) {