Merge branch 'for-linus' of git://neil.brown.name/md

[mv-sheeva.git] / drivers / target / target_core_transport.c

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 28b6292ff298b7f2307e369c5a77acde515fbe5e..236e22d8cfae3e7f3ae66424e320abb7a312b17e 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -379,6 +379,40 @@ void release_se_global(void)
        se_global = NULL;
 }
 
+/* SCSI statistics table index */
+static struct scsi_index_table scsi_index_table;
+
+/*
+ * Initialize the index table for allocating unique row indexes to various mib
+ * tables.
+ */
+void init_scsi_index_table(void)
+{
+       memset(&scsi_index_table, 0, sizeof(struct scsi_index_table));
+       spin_lock_init(&scsi_index_table.lock);
+}
+
+/*
+ * Allocate a new row index for the entry type specified
+ */
+u32 scsi_get_new_index(scsi_index_t type)
+{
+       u32 new_index;
+
+       if ((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)) {
+               printk(KERN_ERR "Invalid index type %d\n", type);
+               return -EINVAL;
+       }
+
+       spin_lock(&scsi_index_table.lock);
+       new_index = ++scsi_index_table.scsi_mib_index[type];
+       if (new_index == 0)
+               new_index = ++scsi_index_table.scsi_mib_index[type];
+       spin_unlock(&scsi_index_table.lock);
+
+       return new_index;
+}
+
 void transport_init_queue_obj(struct se_queue_obj *qobj)
 {
        atomic_set(&qobj->queue_cnt, 0);
@@ -437,7 +471,6 @@ struct se_session *transport_init_session(void)
        }
        INIT_LIST_HEAD(&se_sess->sess_list);
        INIT_LIST_HEAD(&se_sess->sess_acl_list);
-       atomic_set(&se_sess->mib_ref_count, 0);
 
        return se_sess;
 }
@@ -546,12 +579,6 @@ void transport_deregister_session(struct se_session *se_sess)
                transport_free_session(se_sess);
                return;
        }
-       /*
-        * Wait for possible reference in drivers/target/target_core_mib.c:
-        * scsi_att_intr_port_seq_show()
-        */
-       while (atomic_read(&se_sess->mib_ref_count) != 0)
-               cpu_relax();
 
        spin_lock_bh(&se_tpg->session_lock);
        list_del(&se_sess->sess_list);
@@ -574,7 +601,6 @@ void transport_deregister_session(struct se_session *se_sess)
                                spin_unlock_bh(&se_tpg->acl_node_lock);
 
                                core_tpg_wait_for_nacl_pr_ref(se_nacl);
-                               core_tpg_wait_for_mib_ref(se_nacl);
                                core_free_device_list_for_node(se_nacl, se_tpg);
                                TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg,
                                                se_nacl);
@@ -4827,6 +4853,8 @@ static int transport_do_se_mem_map(
 
                return ret;
        }
+
+       BUG_ON(list_empty(se_mem_list));
        /*
         * This is the normal path for all normal non BIDI and BIDI-COMMAND
         * WRITE payloads..  If we need to do BIDI READ passthrough for
@@ -5008,7 +5036,9 @@ transport_map_control_cmd_to_task(struct se_cmd *cmd)
                struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
                u32 se_mem_cnt = 0, task_offset = 0;
 
-               BUG_ON(list_empty(cmd->t_task->t_mem_list));
+               if (!list_empty(T_TASK(cmd)->t_mem_list))
+                       se_mem = list_entry(T_TASK(cmd)->t_mem_list->next,
+                                       struct se_mem, se_list);
 
                ret = transport_do_se_mem_map(dev, task,
                                cmd->t_task->t_mem_list, NULL, se_mem,