dm table: fix missing dm_put_target_type() in dm_table_add_target()

dm_get_target_type() was previously called so any error returned from
dm_table_add_target() must first call dm_put_target_type().  Otherwise
the DM target module's reference count will leak and the associated
kernel module will be unable to be removed.

Also, leverage the fact that r is already -EINVAL and remove an extra
newline.

Fixes: 36a0456 ("dm table: add immutable feature")
Fixes: cc6cbe1 ("dm table: add always writeable feature")
Fixes: 3791e2f ("dm table: add singleton feature")
Cc: stable@vger.kernel.org # 3.2+
Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 3e407a9cde1f190baade6d22e78c30ae5b27b438..c4b53b332607bec3f303671da385656713498e04 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -695,37 +695,32 @@ int dm_table_add_target(struct dm_table *t, const char *type,
 
        tgt->type = dm_get_target_type(type);
        if (!tgt->type) {
-               DMERR("%s: %s: unknown target type", dm_device_name(t->md),
-                     type);
+               DMERR("%s: %s: unknown target type", dm_device_name(t->md), type);
                return -EINVAL;
        }
 
        if (dm_target_needs_singleton(tgt->type)) {
                if (t->num_targets) {
-                       DMERR("%s: target type %s must appear alone in table",
-                             dm_device_name(t->md), type);
-                       return -EINVAL;
+                       tgt->error = "singleton target type must appear alone in table";
+                       goto bad;
                }
                t->singleton = true;
        }
 
        if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) {
-               DMERR("%s: target type %s may not be included in read-only tables",
-                     dm_device_name(t->md), type);
-               return -EINVAL;
+               tgt->error = "target type may not be included in a read-only table";
+               goto bad;
        }
 
        if (t->immutable_target_type) {
                if (t->immutable_target_type != tgt->type) {
-                       DMERR("%s: immutable target type %s cannot be mixed with other target types",
-                             dm_device_name(t->md), t->immutable_target_type->name);
-                       return -EINVAL;
+                       tgt->error = "immutable target type cannot be mixed with other target types";
+                       goto bad;
                }
        } else if (dm_target_is_immutable(tgt->type)) {
                if (t->num_targets) {
-                       DMERR("%s: immutable target type %s cannot be mixed with other target types",
-                             dm_device_name(t->md), tgt->type->name);
-                       return -EINVAL;
+                       tgt->error = "immutable target type cannot be mixed with other target types";
+                       goto bad;
                }
                t->immutable_target_type = tgt->type;
        }
@@ -740,7 +735,6 @@ int dm_table_add_target(struct dm_table *t, const char *type,
         */
        if (!adjoin(t, tgt)) {
                tgt->error = "Gap in table";
-               r = -EINVAL;
                goto bad;
        }