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

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Only request an IRQ mapping for read queues if at least one read queue
is being allocted, as nvme_pci_map_queues() will later on ignore the
unnecessary mapping request should nvme_dev_add() request such an IRQ
mapping even though no read queues are being allocated.  However,
nvme_dev_add() can avoid making the request by checking the number of
read queues without assuming. This would bring it more in line with
nvme_setup_irqs() and nvme_calc_irq_sets().

Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Alan Mikhak 2019-07-08 10:24:12 -07:00 committed by Christoph Hellwig
parent 4fe06923f5
commit 0298d54352
1 changed files with 3 additions and 1 deletions
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4
drivers/nvme/host/pci.c
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@ -2250,7 +2250,9 @@ 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 = 2; /* default + read */
dev->tagset.nr_maps = 1; /* default */
if (dev->io_queues[HCTX_TYPE_READ])
dev->tagset.nr_maps++;
if (dev->io_queues[HCTX_TYPE_POLL])
dev->tagset.nr_maps++;
dev->tagset.timeout = NVME_IO_TIMEOUT;