diff options
| -rw-r--r-- | extras/mini-os/pcifront.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/extras/mini-os/pcifront.c b/extras/mini-os/pcifront.c index a924a6e8d9..5b68d86b56 100644 --- a/extras/mini-os/pcifront.c +++ b/extras/mini-os/pcifront.c @@ -57,6 +57,7 @@ struct pcifront_dev *init_pcifront(char *_nodename) int retry=0; char* msg; char* nodename = _nodename ? _nodename : "device/pci/0"; + int dom; struct pcifront_dev *dev; @@ -64,12 +65,18 @@ struct pcifront_dev *init_pcifront(char *_nodename) printk("******************* PCIFRONT for %s **********\n\n\n", nodename); + snprintf(path, sizeof(path), "%s/backend-id", nodename); + dom = xenbus_read_integer(path); + if (dom == -1) { + printk("no backend\n"); + return NULL; + } + dev = malloc(sizeof(*dev)); memset(dev, 0, sizeof(*dev)); dev->nodename = strdup(nodename); + dev->dom = dom; - snprintf(path, sizeof(path), "%s/backend-id", nodename); - dev->dom = xenbus_read_integer(path); evtchn_alloc_unbound(dev->dom, pcifront_handler, dev, &dev->evtchn); dev->info = (struct xen_pci_sharedinfo*) alloc_page(); |