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Revert "nvme-pci: don't create a read hctx mapping without read queues" 

This reverts commit 0298d54352.

With this patch, set 'poll_queues > hard queues' will lead to 'nr_read_queues = 0'
in nvme_calc_irq_sets. Then poll_queues setting can fail since dev->tagset.nr_maps
equals to 2 and nvme_pci_map_queues will not do map for poll queues.

Signed-off-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
yangerkun 2019-07-23 11:23:13 +08:00 committed by Christoph Hellwig
parent 66b20ac0a1
commit 8fe34be14e
1 changed files with 1 additions and 3 deletions
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4
drivers/nvme/host/pci.c
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@ -2254,9 +2254,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
if (!dev->ctrl.tagset) {
dev->tagset.ops = &nvme_mq_ops;
dev->tagset.nr_hw_queues = dev->online_queues - 1;
dev->tagset.nr_maps = 1; /* default */
if (dev->io_queues[HCTX_TYPE_READ])
dev->tagset.nr_maps++;
dev->tagset.nr_maps = 2; /* default + read */
if (dev->io_queues[HCTX_TYPE_POLL])
dev->tagset.nr_maps++;
dev->tagset.timeout = NVME_IO_TIMEOUT;