target: Add percpu refcounting for se_lun access

[deliverable/linux.git] / drivers / target / target_core_device.c

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index d90dbb0f1a69753a6654413587d9da31a32bdbaa..569a3c7c9e5a65486976a6922c29988c0a8656d9 100644 (file)
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -92,6 +92,9 @@ transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
                se_cmd->pr_res_key = deve->pr_res_key;
                se_cmd->orig_fe_lun = unpacked_lun;
                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+
+               percpu_ref_get(&se_lun->lun_ref);
+               se_cmd->lun_ref_active = true;
        }
        spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 
@@ -119,6 +122,9 @@ transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
                se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
                se_cmd->orig_fe_lun = 0;
                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+
+               percpu_ref_get(&se_lun->lun_ref);
+               se_cmd->lun_ref_active = true;
        }
 
        /* Directly associate cmd with se_dev */
@@ -134,10 +140,6 @@ transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
                dev->read_bytes += se_cmd->data_length;
        spin_unlock_irqrestore(&dev->stats_lock, flags);
 
-       spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
-       list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
-       spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
-
        return 0;
 }
 EXPORT_SYMBOL(transport_lookup_cmd_lun);