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xen/xenbus: ignore console/0

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Unfortunately xend creates a bogus console/0 frotend/backend entry pair
on xenstore that console backends cannot properly cope with.
Any guest behavior that is not completely ignoring console/0 is going
to either cause problems with xenconsoled or qemu.
Returning 0 or -ENODEV from xencons_probe is not enough because it is
going to cause the frontend state to become 4 or 6 respectively.
The best possible thing we can do here is just ignore the entry from
xenbus_probe_frontend.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2012-03-13 18:30:44 +00:00 committed by Konrad Rzeszutek Wilk
parent cf8e019b52
commit 42c46e6ba5
1 changed files with 6 additions and 0 deletions
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6
drivers/xen/xenbus/xenbus_probe_frontend.c
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@ -53,6 +53,12 @@ static int xenbus_probe_frontend(struct xen_bus_type *bus, const char *type,
char *nodename;
int err;
/* ignore console/0 */
if (!strncmp(type, "console", 7) && !strncmp(name, "0", 1)) {
DPRINTK("Ignoring buggy device entry console/0");
return 0;
}
nodename = kasprintf(GFP_KERNEL, "%s/%s/%s", bus->root, type, name);
if (!nodename)
return -ENOMEM;