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PCI/MSI: Ignore affinity if pre/post vector count is more than min_vecs

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min_vecs is the minimum amount of vectors needed to operate in MSI-X mode
which may just include the vectors that don't need affinity.

Disabling affinity settings causes the qla2xxx driver scsi_add_host() to fail
when blk_mq is enabled as the blk_mq_pci_map_queues() expects affinity masks
on each vector.

Fixes: dfef358bd1 ("PCI/MSI: Don't apply affinity if there aren't enough vectors left")
Signed-off-by: Michael Hernandez <michael.hernandez@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org	# v4.10+
This commit is contained in:
Michael Hernandez 2017-05-18 10:47:47 -07:00 • committed by Bjorn Helgaas
parent 2ea659a9ef
commit 6f9a22bc57
3 changed files with 16 additions and 15 deletions
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4
include/linux/interrupt.h
View file

@ -291,7 +291,7 @@ extern int
irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
struct cpumask *irq_create_affinity_masks(int nvec, const struct irq_affinity *affd);
int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd);
int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd);
#else /* CONFIG_SMP */
@ -331,7 +331,7 @@ irq_create_affinity_masks(int nvec, const struct irq_affinity *affd)
}
static inline int
irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd)
irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd)
{
return maxvec;
}