diff mbox

[2/2] nvme: Cleanup nvme_dev_start() and fix IRQ leak

Message ID 20140121100719.GC8847@dhcp-26-207.brq.redhat.com
State Changes Requested
Headers show

Commit Message

Alexander Gordeev Jan. 21, 2014, 10:07 a.m. UTC 
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@redhat.com>
---
 drivers/block/nvme-core.c |   37 +++++++++++++++++++++----------------
 1 files changed, 21 insertions(+), 16 deletions(-)

Comments

Keith Busch Jan. 21, 2014, 7:06 p.m. UTC | #1 
On Tue, 21 Jan 2014, Alexander Gordeev wrote:
> 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@redhat.com>
> ---

> +static void nvme_teardown_admin_queue(struct nvme_dev *dev)
> +{
> +	nvme_disable_queue(dev, 0);
> +	nvme_free_queue(dev->queues[0]);
> +}

> @@ -2402,11 +2398,20 @@ 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);

Oh no! Your new teardown function is freeing the admin queue, but it
would be used immediatly after that in nvme_setup_io_queues ...

> +
> +	if (result)
> 		goto disable;

... but you'll never actually get to setup io queues because the 'result'
here is non-zero if we were successful, and is the number of queues the
controller can allocate. I think you meant to do this instead:

+	if (result < 0)

>
> -	return result;
> +	result = nvme_setup_io_queues(dev, result);
> +	if (result)
> +		goto disable;
> +
> +	return 0;

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diff mbox

Patch

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index c790679..010a789 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -1414,6 +1414,7 @@  static int nvme_configure_admin_queue(struct nvme_dev *dev)
 	if (result)
 		return result;
 
+	dev->entry[0].vector = dev->pci_dev->irq;
 	result = queue_request_irq(dev, nvmeq, "nvme admin");
 	if (result)
 		return result;
@@ -1424,6 +1425,12 @@  static int nvme_configure_admin_queue(struct nvme_dev *dev)
 	return result;
 }
 
+static void nvme_teardown_admin_queue(struct nvme_dev *dev)
+{
+	nvme_disable_queue(dev, 0);
+	nvme_free_queue(dev->queues[0]);
+}
+
 struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
 				unsigned long addr, unsigned length)
 {
@@ -1869,17 +1876,10 @@  static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
 	return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride);
 }
 
-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) {
@@ -1896,9 +1896,6 @@  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]);
-
 	vecs = nr_io_queues;
 	for (i = 0; i < vecs; i++)
 		dev->entry[i].entry = i;
@@ -2069,7 +2066,6 @@  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"))
@@ -2402,11 +2398,20 @@  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);