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NVMe: Handle ioremap failure

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Decrement the number of queues required for doorbell remapping until
the memory is successfully mapped for that size.

Additional checks are done so that we don't call free_irq if it has
already been freed.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Keith Busch 2013-07-15 15:02:24 -06:00 committed by Matthew Wilcox
parent cd63894630
commit 9d713c2bfb
1 changed files with 22 additions and 8 deletions
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30
drivers/block/nvme-core.c
View file

@ -1739,10 +1739,15 @@ static int set_queue_count(struct nvme_dev *dev, int count)
return min(result & 0xffff, result >> 16) + 1;
}
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)
{
struct pci_dev *pdev = dev->pci_dev;
int result, cpu, i, vecs, nr_io_queues, db_bar_size, q_depth;
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);
@ -1751,17 +1756,24 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
if (result < nr_io_queues)
nr_io_queues = result;
/* Deregister the admin queue's interrupt */
free_irq(dev->entry[0].vector, dev->queues[0]);
db_bar_size = 4096 + ((nr_io_queues + 1) << (dev->db_stride + 3));
if (db_bar_size > 8192) {
size = db_bar_size(dev, nr_io_queues);
if (size > 8192) {
iounmap(dev->bar);
dev->bar = ioremap(pci_resource_start(pdev, 0), db_bar_size);
do {
dev->bar = ioremap(pci_resource_start(pdev, 0), size);
if (dev->bar)
break;
if (!--nr_io_queues)
return -ENOMEM;
size = db_bar_size(dev, nr_io_queues);
} while (1);
dev->dbs = ((void __iomem *)dev->bar) + 4096;
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;
@ -1799,8 +1811,10 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
nr_io_queues = vecs;
result = queue_request_irq(dev, dev->queues[0], "nvme admin");
if (result)
if (result) {
dev->queues[0]->q_suspended = 1;
goto free_queues;
}
/* Free previously allocated queues that are no longer usable */
spin_lock(&dev_list_lock);