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| author | Christoph Hellwig <hch@lst.de> | 2017-08-17 12:24:47 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-08-18 08:08:14 -0600 |
| commit | c005390374957baacbc38eef96ea360559510aa7 (patch) | |
| tree | 6055f163f22d993bcf03ed965510a45a8d28745b /block/blk-mq-pci.c | |
| parent | 6caa0503c43d65de92309b967b5b1aa289af303b (diff) | |
| download | lwn-c005390374957baacbc38eef96ea360559510aa7.tar.gz lwn-c005390374957baacbc38eef96ea360559510aa7.zip | |
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>
Diffstat (limited to 'block/blk-mq-pci.c')
| -rw-r--r-- | block/blk-mq-pci.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c index 0c3354cf3552..76944e3271bf 100644 --- a/block/blk-mq-pci.c +++ b/block/blk-mq-pci.c @@ -36,12 +36,18 @@ int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev) for (queue = 0; queue < set->nr_hw_queues; queue++) { mask = pci_irq_get_affinity(pdev, queue); if (!mask) - return -EINVAL; + goto fallback; for_each_cpu(cpu, mask) set->mq_map[cpu] = queue; } return 0; + +fallback: + WARN_ON_ONCE(set->nr_hw_queues > 1); + for_each_possible_cpu(cpu) + set->mq_map[cpu] = 0; + return 0; } EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); |