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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Mike Snitzer <snitzer@redhat.com>,
        James Smart <jsmart2021@gmail.com>,
        Sagi Grimberg <sagi@grimberg.me>,
        Hannes Reinecke <hare@suse.com>,
        Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.0 003/246] nvme-fc: fix numa_node when dev is null
Date:   Thu,  4 Apr 2019 10:45:03 +0200
Message-Id: <20190404084619.364268848@linuxfoundation.org>
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References: <20190404084619.236418459@linuxfoundation.org>
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5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 06f3d71ea071b70e62bcc146cd9ff7ed1f9d4e43 ]

A recent change added a numa_node field to the nvme controller
and has the transport assign the node using dev_to_node().
However, fcloop registers with a NULL device struct, so the
dev_to_node() call oops.

Revise the assignment to assign no node when device struct is null.

Fixes: 103e515efa89b ("nvme: add a numa_node field to struct nvme_ctrl")
Reported-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
[hch: small coding style fixup]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nvme/host/fc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 89accc76d71c..c37d5bbd72ab 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3018,7 +3018,10 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 
 	ctrl->ctrl.opts = opts;
 	ctrl->ctrl.nr_reconnects = 0;
-	ctrl->ctrl.numa_node = dev_to_node(lport->dev);
+	if (lport->dev)
+		ctrl->ctrl.numa_node = dev_to_node(lport->dev);
+	else
+		ctrl->ctrl.numa_node = NUMA_NO_NODE;
 	INIT_LIST_HEAD(&ctrl->ctrl_list);
 	ctrl->lport = lport;
 	ctrl->rport = rport;
-- 
2.19.1