linux-kernel - [PATCH v3 2/4] nvmet-fcloop: Do not wait on completion when unregister fails

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Date:   Tue, 18 Apr 2023 15:01:57 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Sagi Grimberg <sagi@...mberg.me>,
        James Smart <james.smart@...adcom.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Martin Belanger <Martin.Belanger@...l.com>,
        Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v3 2/4] nvmet-fcloop: Do not wait on completion when unregister fails

The nvme_fc_unregister_localport() returns an error code in case that
the locaport pointer is NULL or has already been unegisterd. localport is
is either in the ONLINE state (all resources allocated) or has already
been put into DELETED state.

In this case we will never receive an wakeup call and thus any caller
will hang, e.g. module unload.

Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/nvme/target/fcloop.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 629a90fe4306..57b2d47cf640 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -1163,7 +1163,8 @@ __wait_localport_unreg(struct fcloop_lport *lport)
 
 	ret = nvme_fc_unregister_localport(lport->localport);
 
-	wait_for_completion(&lport->unreg_done);
+	if (!ret)
+		wait_for_completion(&lport->unreg_done);
 
 	kfree(lport);
 
-- 
2.40.0