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>
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index c2169d2..2108cd9 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -628,6 +628,21 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
*/
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);
}
}