Take blk-mq's knowledge into account for calculating io queues. Fix wrong queue mapping in case of kdump kernel. On arm and ppc64, 'maxcpus=1' is passed to kdump kernel command line, see `Documentation/admin-guide/kdump/kdump.rst`, so num_possible_cpus() still returns all CPUs because 'maxcpus=1' just bring up one single cpu core during booting. blk-mq sees single queue in kdump kernel, and in driver's viewpoint there are still multiple queues, this inconsistency causes driver to apply wrong queue mapping for handling IO, and IO timeout is triggered. Meantime, single queue makes much less resource utilization, and reduce risk of kernel failure. Cc: Sathya Prakash <sathya.prakash@xxxxxxxxxxxx> Cc: Sreekanth Reddy <sreekanth.reddy@xxxxxxxxxxxx> Cc: Suganath Prabu Subramani <suganath-prabu.subramani@xxxxxxxxxxxx> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> --- drivers/scsi/mpt3sas/mpt3sas_base.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 53f5492579cb..18a73d3ff00b 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -3332,8 +3332,8 @@ _base_alloc_irq_vectors(struct MPT3SAS_ADAPTER *ioc) * Don't allocate msix vectors for poll_queues. * msix_vectors is always within a range of FW supported reply queue. */ - int nr_msix_vectors = ioc->iopoll_q_start_index; - + int nr_msix_vectors = min_t(unsigned int, ioc->iopoll_q_start_index, + blk_mq_max_nr_hw_queues()); if (ioc->smp_affinity_enable) irq_flags |= PCI_IRQ_AFFINITY | PCI_IRQ_ALL_TYPES; -- 2.40.1
