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scsi: keep device alive while it has requests 

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-06-03 14:09:39 +02:00
parent 6046c62086
commit cac3c384bb
1 changed files with 10 additions and 2 deletions
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12
hw/scsi/scsi-bus.c
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@ -505,10 +505,12 @@ SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
uint32_t tag, uint32_t lun, void *hba_private)
{
SCSIRequest *req;
SCSIBus *bus = scsi_bus_from_device(d);
BusState *qbus = BUS(bus);
req = g_malloc0(reqops->size);
req->refcount = 1;
req->bus = scsi_bus_from_device(d);
req->bus = bus;
req->dev = d;
req->tag = tag;
req->lun = lun;
@ -516,6 +518,8 @@ SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
req->status = -1;
req->sense_len = 0;
req->ops = reqops;
object_ref(OBJECT(d));
object_ref(OBJECT(qbus->parent));
trace_scsi_req_alloc(req->dev->id, req->lun, req->tag);
return req;
}
@ -1498,13 +1502,17 @@ void scsi_req_unref(SCSIRequest *req)
{
assert(req->refcount > 0);
if (--req->refcount == 0) {
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, req->dev->qdev.parent_bus);
BusState *qbus = req->dev->qdev.parent_bus;
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, qbus);
if (bus->info->free_request && req->hba_private) {
bus->info->free_request(bus, req->hba_private);
}
if (req->ops->free_req) {
req->ops->free_req(req);
}
object_unref(OBJECT(req->dev));
object_unref(OBJECT(qbus->parent));
g_free(req);
}
}