diff options
| author | Ming Lei <[email protected]> | 2018-03-13 17:42:42 +0800 |
|---|---|---|
| committer | Martin K. Petersen <[email protected]> | 2018-03-14 23:31:13 -0400 |
| commit | b5b6e8c8d3b4cbeb447a0f10c7d5de3caa573299 (patch) | |
| tree | 50a246c6410e50d21c359d84b328b722860627d2 /lib/test-string_helpers.c | |
| parent | 2f31115e940c4afd49b99c33123534e2ac924ffb (diff) | |
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 <[email protected]>,
Cc: "Martin K. Petersen" <[email protected]>,
Cc: James Bottomley <[email protected]>,
Cc: Christoph Hellwig <[email protected]>,
Cc: Don Brace <[email protected]>
Cc: Kashyap Desai <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Mike Snitzer <[email protected]>
Cc: Laurence Oberman <[email protected]>
Fixes: 84676c1f21e8 ("genirq/affinity: assign vectors to all possible CPUs")
Signed-off-by: Ming Lei <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Acked-by: Paolo Bonzini <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Diffstat (limited to 'lib/test-string_helpers.c')
0 files changed, 0 insertions, 0 deletions