[PATCH] tcmu: wait for nl reply only if there are listeners

[Mike Christie <mchristi@redhat.com>]

genlmsg_multicast_allns used to return -ESRCH even if the message was
successfully sent to a listener. With commit:

commit cb9f7a9a5c96a773bbc9c70660dc600cfff82f82
Author: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date:   Tue Feb 6 14:48:32 2018 +0100

    netlink: ensure to loop over all netns in genlmsg_multicast_allns()

it now will return success if the message was sent to a listener. With
that patch, tcmu can now immediately fail if -ESRCH is returned because
we know there will be no reply.

Signed-off-by: Mike Christie <mchristi@redhat.com>

---
 drivers/target/target_core_user.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 5831e0e..dccc13c 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1794,9 +1794,6 @@ static int tcmu_netlink_event_send(struct tcmu_dev *udev,
 
 	ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0,
 				      TCMU_MCGRP_CONFIG, GFP_KERNEL);
-	/* We don't care if no one is listening */
-	if (ret = -ESRCH)
-		ret = 0;
 	if (!ret)
 		ret = tcmu_wait_genl_cmd_reply(udev);
 	return ret;
-- 
1.8.3.1