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-rw-r--r--drivers/firewire/fw-sbp2.c36
1 files changed, 26 insertions, 10 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index 17bf0e1468e..d334cac5e1f 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -173,6 +173,9 @@ struct sbp2_target {
int blocked; /* ditto */
};
+/* Impossible login_id, to detect logout attempt before successful login */
+#define INVALID_LOGIN_ID 0x10000
+
/*
* Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
* provided in the config rom. Most devices do provide a value, which
@@ -788,9 +791,20 @@ static void sbp2_release_target(struct kref *kref)
scsi_remove_device(sdev);
scsi_device_put(sdev);
}
- sbp2_send_management_orb(lu, tgt->node_id, lu->generation,
- SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
-
+ if (lu->login_id != INVALID_LOGIN_ID) {
+ int generation, node_id;
+ /*
+ * tgt->node_id may be obsolete here if we failed
+ * during initial login or after a bus reset where
+ * the topology changed.
+ */
+ generation = device->generation;
+ smp_rmb(); /* node_id vs. generation */
+ node_id = device->node_id;
+ sbp2_send_management_orb(lu, node_id, generation,
+ SBP2_LOGOUT_REQUEST,
+ lu->login_id, NULL);
+ }
fw_core_remove_address_handler(&lu->address_handler);
list_del(&lu->link);
kfree(lu);
@@ -805,19 +819,20 @@ static void sbp2_release_target(struct kref *kref)
static struct workqueue_struct *sbp2_wq;
+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)
{
- 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);
+ kref_get(&lu->tgt->kref);
+ if (!queue_delayed_work(sbp2_wq, &lu->work, delay))
+ sbp2_target_put(lu->tgt);
}
/*
@@ -978,6 +993,7 @@ static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
lu->tgt = tgt;
lu->lun = lun_entry & 0xffff;
+ lu->login_id = INVALID_LOGIN_ID;
lu->retries = 0;
lu->has_sdev = false;
lu->blocked = false;