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| author | Ming Lei <ming.lei@redhat.com> | 2018-03-13 12:42:42 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-03-15 06:31:13 +0300 |
| commit | b5b6e8c8d3b4cbeb447a0f10c7d5de3caa573299 (patch) | |
| tree | 50a246c6410e50d21c359d84b328b722860627d2 /drivers/scsi/scsi_lib_dma.c | |
| parent | 2f31115e940c4afd49b99c33123534e2ac924ffb (diff) | |
| download | linux-b5b6e8c8d3b4cbeb447a0f10c7d5de3caa573299.tar.xz | |
scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
Since commit 84676c1f21e8ff5 ("genirq/affinity: assign vectors to all
possible CPUs") it is possible to end up in a scenario where only
offline CPUs are mapped to an interrupt vector.
This is only an issue for the legacy I/O path since with blk-mq/scsi-mq
an I/O can't be submitted to a hardware queue if the queue isn't mapped
to an online CPU.
Fix this issue by forcing virtio-scsi to use blk-mq.
[mkp: commit desc]
Cc: Omar Sandoval <osandov@fb.com>,
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Cc: James Bottomley <james.bottomley@hansenpartnership.com>,
Cc: Christoph Hellwig <hch@lst.de>,
Cc: Don Brace <don.brace@microsemi.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Laurence Oberman <loberman@redhat.com>
Fixes: 84676c1f21e8 ("genirq/affinity: assign vectors to all possible CPUs")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib_dma.c')
0 files changed, 0 insertions, 0 deletions