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author | Keir Fraser <keir.fraser@citrix.com> | 2008-07-31 13:30:24 +0100 |
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committer | Keir Fraser <keir.fraser@citrix.com> | 2008-07-31 13:30:24 +0100 |
commit | adacb92a2b5e3ef66b924dc59ab1c2b2c98195c6 (patch) | |
tree | 9feb512dfb6331edfd2405389a9767ec7c89ba39 /extras/mini-os/pcifront.c | |
parent | dfad53d5feed1111c2f660fb4d8e44ac004cf206 (diff) | |
download | xen-adacb92a2b5e3ef66b924dc59ab1c2b2c98195c6.tar.gz xen-adacb92a2b5e3ef66b924dc59ab1c2b2c98195c6.tar.bz2 xen-adacb92a2b5e3ef66b924dc59ab1c2b2c98195c6.zip |
mini-os: make init_pcifront fail early if there is no backend
Else, we would leave entries in xenstore, which disturbs xend.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
Diffstat (limited to 'extras/mini-os/pcifront.c')
-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(); |