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>

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);