linux-kernel - [PATCH] nvme: Cleanup nvme_dev

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Message-ID: <20140120084314.GD19068@dhcp-26-207.brq.redhat.com>
Date:	Mon, 20 Jan 2014 09:43:14 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Keith Busch <keith.busch@...el.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-nvme@...ts.infradead.org,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: [PATCH] nvme: Cleanup nvme_dev_start()

This update fixes an oddity when a device is first added
and then removed from dev_list in case of initialization
failure, instead of just being added in case of success.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/block/nvme-core.c |   19 ++++++++-----------
 1 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index e1e4ad4..e4e12be 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -2105,29 +2105,26 @@ static int nvme_dev_start(struct nvme_dev *dev)
 	if (result)
 		goto unmap;
 
-	spin_lock(&dev_list_lock);
-	list_add(&dev->node, &dev_list);
-	spin_unlock(&dev_list_lock);
-
 	result = set_queue_count(dev, num_online_cpus());
 	if (result == -EBUSY)
-		return -EBUSY;
+		goto adddev;
 
 	nvme_teardown_admin_queue(dev);
 
 	if (result)
-		goto disable;
+		goto unmap;
 
 	result = nvme_setup_io_queues(dev, result);
 	if (result)
-		goto disable;
-
-	return 0;
+		goto unmap;
 
- disable:
+ adddev:
 	spin_lock(&dev_list_lock);
-	list_del_init(&dev->node);
+	list_add(&dev->node, &dev_list);
 	spin_unlock(&dev_list_lock);
+
+	return result;
+
  unmap:
 	nvme_dev_unmap(dev);
 	return result;
-- 
1.7.7.6

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
--
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