linux-kernel - [PATCH] nvme: Cleanup nvme_dev

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Message-ID: <20140120084212.GC19068@dhcp-26-207.brq.redhat.com>
Date:	Mon, 20 Jan 2014 09:42:12 +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() and fix IRQ leak

This is an attempt to make handling of admin queue in a
single scope. This update also fixes a IRQ leak in case
nvme_setup_io_queues() failed to allocate enough iomem
and bailed out with -ENOMEM errno.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/block/nvme-core.c |   44 +++++++++++++++++++++++---------------------
 1 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 3e1ae55..e1e4ad4 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -1287,6 +1287,7 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev)
 	if (result)
 		return result;
 
+	dev->entry[0].vector = pdev->pci_dev->irq;
 	result = queue_request_irq(dev, nvmeq, "nvme admin");
 	if (result)
 		return result;
@@ -1297,6 +1298,11 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev)
 	return result;
 }
 
+static int nvme_teardown_admin_queue(struct nvme_dev *dev)
+{
+	free_irq(dev->entry[0].vector, dev->queues[0]);
+}
+
 struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
 				unsigned long addr, unsigned length)
 {
@@ -1744,17 +1750,10 @@ static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
 	return 4096 + ((nr_io_queues + 1) << (dev->db_stride + 3));
 }
 
-static int nvme_setup_io_queues(struct nvme_dev *dev)
+static int nvme_setup_io_queues(struct nvme_dev *dev, int nr_io_queues)
 {
 	struct pci_dev *pdev = dev->pci_dev;
-	int result, cpu, i, vecs, nr_io_queues, size, q_depth;
-
-	nr_io_queues = num_online_cpus();
-	result = set_queue_count(dev, nr_io_queues);
-	if (result < 0)
-		return result;
-	if (result < nr_io_queues)
-		nr_io_queues = result;
+	int result, cpu, i, vecs, size, q_depth;
 
 	size = db_bar_size(dev, nr_io_queues);
 	if (size > 8192) {
@@ -1771,20 +1770,15 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
 		dev->queues[0]->q_db = dev->dbs;
 	}
 
-	/* Deregister the admin queue's interrupt */
-	free_irq(dev->entry[0].vector, dev->queues[0]);
-
 	for (i = 0; i < nr_io_queues; i++)
 		dev->entry[i].entry = i;
 	vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues);
 	if (vecs < 0) {
 		vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32));
-		if (vecs < 0) {
+		if (vecs < 0)
 			vecs = 1;
-		} else {
-			for (i = 0; i < vecs; i++)
-				dev->entry[i].vector = i + pdev->irq;
-		}
+		for (i = 0; i < vecs; i++)
+			dev->entry[i].vector = i + pdev->irq;
 	}
 
 	/*
@@ -1928,7 +1922,6 @@ static int nvme_dev_map(struct nvme_dev *dev)
 	if (pci_enable_device_mem(pdev))
 		return result;
 
-	dev->entry[0].vector = pdev->irq;
 	pci_set_master(pdev);
 	bars = pci_select_bars(pdev, IORESOURCE_MEM);
 	if (pci_request_selected_regions(pdev, bars, "nvme"))
@@ -2116,11 +2109,20 @@ static int nvme_dev_start(struct nvme_dev *dev)
 	list_add(&dev->node, &dev_list);
 	spin_unlock(&dev_list_lock);
 
-	result = nvme_setup_io_queues(dev);
-	if (result && result != -EBUSY)
+	result = set_queue_count(dev, num_online_cpus());
+	if (result == -EBUSY)
+		return -EBUSY;
+
+	nvme_teardown_admin_queue(dev);
+
+	if (result)
 		goto disable;
 
-	return result;
+	result = nvme_setup_io_queues(dev, result);
+	if (result)
+		goto disable;
+
+	return 0;
 
  disable:
 	spin_lock(&dev_list_lock);
-- 
1.7.7.6

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