drbd: drbd_adm_down(): Move valid resource name check to drbd_adm_prepare()

Signed-off-by: Andreas Gruenbacher <agruen@linbit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>

drivers/block/drbd/drbd_nl.c

@@ -221,6 +221,8 @@ static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
 	}
 	if (!adm_ctx.connection && (flags & DRBD_ADM_NEED_RESOURCE)) {
 		drbd_msg_put_info("unknown resource");
+		if (adm_ctx.resource_name)
+			return ERR_RES_NOT_KNOWN;
 		return ERR_INVALID_REQUEST;
 	}
 
@@ -3355,17 +3357,12 @@ int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
 	struct drbd_device *device;
 	unsigned i;
 
-	retcode = drbd_adm_prepare(skb, info, 0);
+	retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
 	if (!adm_ctx.reply_skb)
 		return retcode;
 	if (retcode != NO_ERROR)
 		goto out;
 
-	if (!adm_ctx.connection) {
-		retcode = ERR_RES_NOT_KNOWN;
-		goto out;
-	}
-
 	/* demote */
 	idr_for_each_entry(&adm_ctx.connection->volumes, device, i) {
 		retcode = drbd_set_role(device, R_SECONDARY, 0);