[PATCH v2 5/6] virtio-scsi: fix various bad behavior on aborted requests
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From: Paolo Bonzini <pbonzini@redhat.com>
Date: 2014-06-04 10:13:08
Also in:
linux-scsi, lkml
Subsystem:
scsi subsystem, the rest, virtio block and scsi drivers · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Revision v2 of 2 in this series.
Revisions (2)
- v2 current
- v3 [diff vs current]
Even though the virtio-scsi spec guarantees that all requests related to the TMF will have been completed by the time the TMF itself completes, the request queue's callback might not have run yet. This causes requests to be completed more than once, and as a result triggers a variety of BUGs or oopses. Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- drivers/scsi/virtio_scsi.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index d66c4ee2c774..fda9fb358888 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c@@ -235,6 +235,16 @@ static void virtscsi_req_done(struct virtqueue *vq) virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); }; +static void virtscsi_poll_requests(struct virtio_scsi *vscsi) +{ + int i, num_vqs; + + num_vqs = vscsi->num_queues; + for (i = 0; i < num_vqs; i++) + virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], + virtscsi_complete_cmd); +} + static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) { struct virtio_scsi_cmd *cmd = buf;
@@ -579,6 +589,18 @@ static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) ret = SUCCESS; + /* + * The spec guarantees that all requests related to the TMF have + * been completed, but the callback might not have run yet if + * we're using independent interrupts (e.g. MSI). Poll the + * virtqueues once. + * + * In the abort case, sc->scsi_done will do nothing, because + * the block layer must have detected a timeout and as a result + * REQ_ATOM_COMPLETE has been set. + */ + virtscsi_poll_requests(vscsi); + out: mempool_free(cmd, virtscsi_cmd_pool); return ret;
--
1.8.3.1