linux-kernel - [PATCH AUTOSEL for 4.9 128/156] nvme: use kref_get_unless_zero in nvme_find_get

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Message-ID: <20171207154845.4814-128-alexander.levin@verizon.com>
Date:   Thu, 7 Dec 2017 15:49:27 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Christoph Hellwig <hch@....de>, alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 128/156] nvme: use kref_get_unless_zero in
 nvme_find_get_ns

From: Christoph Hellwig <hch@....de>

[ Upstream commit 2dd4122854f697afc777582d18548dded03ce5dd ]

For kref_get_unless_zero to protect against lookup vs free races we need
to use it in all places where we aren't guaranteed to already hold a
reference.  There is no such guarantee in nvme_find_get_ns, so switch to
kref_get_unless_zero in this function.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/nvme/host/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index fbeca065f18c..719ee5fb2626 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1619,7 +1619,8 @@ static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	mutex_lock(&ctrl->namespaces_mutex);
 	list_for_each_entry(ns, &ctrl->namespaces, list) {
 		if (ns->ns_id == nsid) {
-			kref_get(&ns->kref);
+			if (!kref_get_unless_zero(&ns->kref))
+				continue;
 			ret = ns;
 			break;
 		}
-- 
2.11.0