From fc7e847539487a8cb7f3553789048bb13b19a7f0 Mon Sep 17 00:00:00 2001
From: GangCao <gang.cao@intel.com>
Date: Tue, 16 Jan 2018 20:06:52 -0500
Subject: [PATCH] nvmf: check whether the transport already in poll group

Add a check when adding transport in the poll group.
If already there, just return.

The poll_group_add_transport operation can be called
at the poll group creation and target listen both.

Change-Id: I655d6fa97cafdc11fa23d199bdfe31350b920ca4
Signed-off-by: GangCao <gang.cao@intel.com>
Reviewed-on: https://review.gerrithub.io/395039
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
---
 lib/nvmf/nvmf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/nvmf/nvmf.c b/lib/nvmf/nvmf.c
index d780953fe..76623c1d7 100644
--- a/lib/nvmf/nvmf.c
+++ b/lib/nvmf/nvmf.c
@@ -398,6 +398,13 @@ spdk_nvmf_poll_group_add_transport(struct spdk_nvmf_poll_group *group,
 {
 	struct spdk_nvmf_transport_poll_group *tgroup;
 
+	TAILQ_FOREACH(tgroup, &group->tgroups, link) {
+		if (tgroup->transport == transport) {
+			/* Transport already in the poll group */
+			return 0;
+		}
+	}
+
 	tgroup = spdk_nvmf_transport_poll_group_create(transport);
 	if (!tgroup) {
 		SPDK_ERRLOG("Unable to create poll group for transport\n");