firewire: sbp2: remove obsolete reference counting

Since commit 0278ccd9d53e07c4e699432b2fed9de6c56f506c "firewire: sbp2:
fix panic after rmmod with slow targets", the lifetime of an sbp2_target
instance does no longer extent past the return of sbp2_remove().
Therefore it is no longer necessary to call fw_unit_get/put() and
fw_device_get/put() in sbp2_probe/remove().

Furthermore, said commit also ensures that lu->work is not going to be
executed or requeued at a time when the sbp2_target is no longer in use.
Hence there is no need for sbp2_target reference counting for lu->work.

Other concurrent contexts:

  - Processes which access the sysfs of the SCSI host device or of one
    of its subdevices are safe because these interfaces are all removed
    by scsi_remove_device/host() in sbp2_release_target().

  - SBP-2 command block ORB transactions are finished when
    scsi_remove_device() in sbp2_release_target() returns.

  - SBP-2 management ORB transactions are finished when
    cancel_delayed_work_sync(&lu->work) before sbp2_release_target()
    returns.

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

1 files changed, 17 insertions, 40 deletions

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 17cef864506..a2715b20ede 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -159,7 +159,6 @@ struct sbp2_logical_unit {
  * and one struct Scsi_Host per sbp2_target.
  */
 struct sbp2_target {
-        struct kref kref;
         struct fw_unit *unit;
         const char *bus_id;
         struct list_head lu_list;
@@ -772,9 +771,8 @@ static int sbp2_lun2int(u16 lun)
         return scsilun_to_int(&eight_bytes_lun);
 }
 
-static void sbp2_release_target(struct kref *kref)
+static void sbp2_release_target(struct sbp2_target *tgt)
 {
-        struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref);
         struct sbp2_logical_unit *lu, *next;
         struct Scsi_Host *shost =
                 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
@@ -811,30 +809,12 @@ static void sbp2_release_target(struct kref *kref)
         scsi_remove_host(shost);
         fw_notify("released %s, target %d:0:0\n", tgt->bus_id, shost->host_no);
 
-        fw_unit_put(tgt->unit);
         scsi_host_put(shost);
-        fw_device_put(device);
-}
-
-static void sbp2_target_get(struct sbp2_target *tgt)
-{
-        kref_get(&tgt->kref);
-}
-
-static void sbp2_target_put(struct sbp2_target *tgt)
-{
-        kref_put(&tgt->kref, sbp2_release_target);
 }
 
-/*
- * 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)
 {
-        sbp2_target_get(lu->tgt);
-        if (!queue_delayed_work(fw_workqueue, &lu->work, delay))
-                sbp2_target_put(lu->tgt);
+        queue_delayed_work(fw_workqueue, &lu->work, delay);
 }
 
 /*
@@ -877,7 +857,7 @@ static void sbp2_login(struct work_struct *work)
         int generation, node_id, local_node_id;
 
         if (fw_device_is_shutdown(device))
-                goto out;
+                return;
 
         generation    = device->generation;
         smp_rmb();    /* node IDs must not be older than generation */
@@ -899,7 +879,7 @@ static void sbp2_login(struct work_struct *work)
                         /* Let any waiting I/O fail from now on. */
                         sbp2_unblock(lu->tgt);
                 }
-                goto out;
+                return;
         }
 
         tgt->node_id      = node_id;
@@ -925,7 +905,8 @@ static void sbp2_login(struct work_struct *work)
         if (lu->has_sdev) {
                 sbp2_cancel_orbs(lu);
                 sbp2_conditionally_unblock(lu);
-                goto out;
+
+                return;
         }
 
         if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY)
@@ -957,7 +938,8 @@ static void sbp2_login(struct work_struct *work)
         lu->has_sdev = true;
         scsi_device_put(sdev);
         sbp2_allow_block(lu);
-        goto out;
+
+        return;
 
  out_logout_login:
         smp_rmb(); /* generation may have changed */
@@ -971,8 +953,6 @@ static void sbp2_login(struct work_struct *work)
          * lu->work already.  Reset the work from reconnect to login.
          */
         PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
- out:
-        sbp2_target_put(tgt);
 }
 
 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
@@ -1141,7 +1121,6 @@ static int sbp2_probe(struct device *dev)
         tgt = (struct sbp2_target *)shost->hostdata;
         dev_set_drvdata(&unit->device, tgt);
         tgt->unit = unit;
-        kref_init(&tgt->kref);
         INIT_LIST_HEAD(&tgt->lu_list);
         tgt->bus_id = dev_name(&unit->device);
         tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
@@ -1154,9 +1133,6 @@ static int sbp2_probe(struct device *dev)
         if (scsi_add_host(shost, &unit->device) < 0)
                 goto fail_shost_put;
 
-        fw_device_get(device);
-        fw_unit_get(unit);
-
         /* implicit directory ID */
         tgt->directory_id = ((unit->directory - device->config_rom) * 4
                              + CSR_CONFIG_ROM) & 0xffffff;
@@ -1166,7 +1142,7 @@ static int sbp2_probe(struct device *dev)
 
         if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
                                &firmware_revision) < 0)
-                goto fail_tgt_put;
+                goto fail_release_target;
 
         sbp2_clamp_management_orb_timeout(tgt);
         sbp2_init_workarounds(tgt, model, firmware_revision);
@@ -1183,10 +1159,11 @@ static int sbp2_probe(struct device *dev)
         /* Do the login in a workqueue so we can easily reschedule retries. */
         list_for_each_entry(lu, &tgt->lu_list, link)
                 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
+
         return 0;
 
- fail_tgt_put:
-        sbp2_target_put(tgt);
+ fail_release_target:
+        sbp2_release_target(tgt);
         return -ENOMEM;
 
  fail_shost_put:
@@ -1203,7 +1180,8 @@ static int sbp2_remove(struct device *dev)
         list_for_each_entry(lu, &tgt->lu_list, link)
                 cancel_delayed_work_sync(&lu->work);
 
-        sbp2_target_put(tgt);
+        sbp2_release_target(tgt);
+
         return 0;
 }
 
@@ -1216,7 +1194,7 @@ static void sbp2_reconnect(struct work_struct *work)
         int generation, node_id, local_node_id;
 
         if (fw_device_is_shutdown(device))
-                goto out;
+                return;
 
         generation    = device->generation;
         smp_rmb();    /* node IDs must not be older than generation */
@@ -1241,7 +1219,8 @@ static void sbp2_reconnect(struct work_struct *work)
                         PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
                 }
                 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
-                goto out;
+
+                return;
         }
 
         tgt->node_id      = node_id;
@@ -1255,8 +1234,6 @@ static void sbp2_reconnect(struct work_struct *work)
         sbp2_agent_reset(lu);
         sbp2_cancel_orbs(lu);
         sbp2_conditionally_unblock(lu);
- out:
-        sbp2_target_put(tgt);
 }
 
 static void sbp2_update(struct fw_unit *unit)