firewire: fw-sbp2: refactor workq and kref handling

This somewhat reduces the size of firewire-sbp2.ko.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 30 insertions, 26 deletions

diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index c2169d215bf7..2108cd92451b 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -628,6 +628,21 @@ static void sbp2_release_target(struct kref *kref)
 
 static struct workqueue_struct *sbp2_wq;
 
+/*
+ * Always get the target's kref when scheduling work on one its units.
+ * Each workqueue job is responsible to call sbp2_target_put() upon return.
+ */
+static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
+{
+        if (queue_delayed_work(sbp2_wq, &lu->work, delay))
+                kref_get(&lu->tgt->kref);
+}
+
+static void sbp2_target_put(struct sbp2_target *tgt)
+{
+        kref_put(&tgt->kref, sbp2_release_target);
+}
+
 static void sbp2_reconnect(struct work_struct *work);
 
 static void sbp2_login(struct work_struct *work)
@@ -649,16 +664,12 @@ static void sbp2_login(struct work_struct *work)
 
         if (sbp2_send_management_orb(lu, node_id, generation,
                                 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
-                if (lu->retries++ < 5) {
-                        if (queue_delayed_work(sbp2_wq, &lu->work,
-                                               DIV_ROUND_UP(HZ, 5)))
-                                kref_get(&lu->tgt->kref);
-                } else {
+                if (lu->retries++ < 5)
+                        sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
+                else
                         fw_error("failed to login to %s LUN %04x\n",
                                  unit->device.bus_id, lu->lun);
-                }
-                kref_put(&lu->tgt->kref, sbp2_release_target);
-                return;
+                goto out;
         }
 
         lu->generation        = generation;
@@ -700,7 +711,8 @@ static void sbp2_login(struct work_struct *work)
                 lu->sdev = sdev;
                 scsi_device_put(sdev);
         }
-        kref_put(&lu->tgt->kref, sbp2_release_target);
+ out:
+        sbp2_target_put(lu->tgt);
 }
 
 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
@@ -865,18 +877,13 @@ static int sbp2_probe(struct device *dev)
 
         get_device(&unit->device);
 
-        /*
-         * We schedule work to do the login so we can easily
-         * reschedule retries. Always get the ref before scheduling
-         * work.
-         */
+        /* Do the login in a workqueue so we can easily reschedule retries. */
         list_for_each_entry(lu, &tgt->lu_list, link)
-                if (queue_delayed_work(sbp2_wq, &lu->work, 0))
-                        kref_get(&tgt->kref);
+                sbp2_queue_work(lu, 0);
         return 0;
 
  fail_tgt_put:
-        kref_put(&tgt->kref, sbp2_release_target);
+        sbp2_target_put(tgt);
         return -ENOMEM;
 
  fail_shost_put:
@@ -889,7 +896,7 @@ static int sbp2_remove(struct device *dev)
         struct fw_unit *unit = fw_unit(dev);
         struct sbp2_target *tgt = unit->device.driver_data;
 
-        kref_put(&tgt->kref, sbp2_release_target);
+        sbp2_target_put(tgt);
         return 0;
 }
 
@@ -915,10 +922,8 @@ static void sbp2_reconnect(struct work_struct *work)
                         lu->retries = 0;
                         PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
                 }
-                if (queue_delayed_work(sbp2_wq, &lu->work, DIV_ROUND_UP(HZ, 5)))
-                        kref_get(&lu->tgt->kref);
-                kref_put(&lu->tgt->kref, sbp2_release_target);
-                return;
+                sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
+                goto out;
         }
 
         lu->generation        = generation;
@@ -930,8 +935,8 @@ static void sbp2_reconnect(struct work_struct *work)
 
         sbp2_agent_reset(lu);
         sbp2_cancel_orbs(lu);
-
-        kref_put(&lu->tgt->kref, sbp2_release_target);
+ out:
+        sbp2_target_put(lu->tgt);
 }
 
 static void sbp2_update(struct fw_unit *unit)
@@ -947,8 +952,7 @@ static void sbp2_update(struct fw_unit *unit)
          */
         list_for_each_entry(lu, &tgt->lu_list, link) {
                 lu->retries = 0;
-                if (queue_delayed_work(sbp2_wq, &lu->work, 0))
-                        kref_get(&tgt->kref);
+                sbp2_queue_work(lu, 0);
         }
 }