dm: do not allocate any mempools for blk-mq request-based DM

[firefly-linux-kernel-4.4.55.git] / drivers / md / dm-table.c

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 3662b2e49b8dd8603fae86ef8e53912c642b27e1..85e1d39e9a38a568b7c05c1e4d49eda2e9b118fe 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -820,6 +820,12 @@ void dm_consume_args(struct dm_arg_set *as, unsigned num_args)
 }
 EXPORT_SYMBOL(dm_consume_args);
 
+static bool __table_type_request_based(unsigned table_type)
+{
+       return (table_type == DM_TYPE_REQUEST_BASED ||
+               table_type == DM_TYPE_MQ_REQUEST_BASED);
+}
+
 static int dm_table_set_type(struct dm_table *t)
 {
        unsigned i;
@@ -852,8 +858,7 @@ static int dm_table_set_type(struct dm_table *t)
                 * Determine the type from the live device.
                 * Default to bio-based if device is new.
                 */
-               if (live_md_type == DM_TYPE_REQUEST_BASED ||
-                   live_md_type == DM_TYPE_MQ_REQUEST_BASED)
+               if (__table_type_request_based(live_md_type))
                        request_based = 1;
                else
                        bio_based = 1;
@@ -903,7 +908,7 @@ static int dm_table_set_type(struct dm_table *t)
                        }
                t->type = DM_TYPE_MQ_REQUEST_BASED;
 
-       } else if (hybrid && list_empty(devices) && live_md_type != DM_TYPE_NONE) {
+       } else if (list_empty(devices) && __table_type_request_based(live_md_type)) {
                /* inherit live MD type */
                t->type = live_md_type;
 
@@ -925,10 +930,7 @@ struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
 
 bool dm_table_request_based(struct dm_table *t)
 {
-       unsigned table_type = dm_table_get_type(t);
-
-       return (table_type == DM_TYPE_REQUEST_BASED ||
-               table_type == DM_TYPE_MQ_REQUEST_BASED);
+       return __table_type_request_based(dm_table_get_type(t));
 }
 
 bool dm_table_mq_request_based(struct dm_table *t)
@@ -962,8 +964,8 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
                return -EINVAL;
        }
 
-       if (!t->mempools)
-               return -ENOMEM;
+       if (IS_ERR(t->mempools))
+               return PTR_ERR(t->mempools);
 
        return 0;
 }