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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, Keith Busch <keith.busch@intel.com>,
        Christoph Hellwig <hch@lst.de>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.20 146/171] nvme-pci: add missing unlock for reset error
Date:   Tue, 12 Mar 2019 10:08:46 -0700
Message-Id: <20190312170400.169268829@linuxfoundation.org>
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4.20-stable review patch.  If anyone has any objections, please let me know.

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

[ Upstream commit 4726bcf30fad37cc555cd9dcd6c73f2b2668c879 ]

The reset work holds a mutex to prevent races with removal modifying the
same resources, but was unlocking only on success. Unlock on failure
too.

Fixes: 5c959d73dba64 ("nvme-pci: fix rapid add remove sequence")
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nvme/host/pci.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 439b9f4eb246..5c58e0ffa3ac 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2283,15 +2283,15 @@ static void nvme_reset_work(struct work_struct *work)
 	mutex_lock(&dev->shutdown_lock);
 	result = nvme_pci_enable(dev);
 	if (result)
-		goto out;
+		goto out_unlock;
 
 	result = nvme_pci_configure_admin_queue(dev);
 	if (result)
-		goto out;
+		goto out_unlock;
 
 	result = nvme_alloc_admin_tags(dev);
 	if (result)
-		goto out;
+		goto out_unlock;
 
 	/*
 	 * Limit the max command size to prevent iod->sg allocations going
@@ -2374,6 +2374,8 @@ static void nvme_reset_work(struct work_struct *work)
 	nvme_start_ctrl(&dev->ctrl);
 	return;
 
+ out_unlock:
+	mutex_unlock(&dev->shutdown_lock);
  out:
 	nvme_remove_dead_ctrl(dev, result);
 }
-- 
2.19.1