blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL
While pci_irq_get_affinity should never fail for SMP kernel that implement the affinity mapping, it will always return NULL in the UP case, so provide a fallback mapping of all queues to CPU 0 in that case. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -36,12 +36,18 @@ int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev)
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for (queue = 0; queue < set->nr_hw_queues; queue++) {
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mask = pci_irq_get_affinity(pdev, queue);
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if (!mask)
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return -EINVAL;
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goto fallback;
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for_each_cpu(cpu, mask)
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set->mq_map[cpu] = queue;
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}
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return 0;
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fallback:
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WARN_ON_ONCE(set->nr_hw_queues > 1);
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for_each_possible_cpu(cpu)
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set->mq_map[cpu] = 0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues);
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