Commit 42c46e6b authored Mar 13, 2012 by Stefano Stabellini Committed by Konrad Rzeszutek Wilk Mar 13, 2012

xen/xenbus: ignore console/0



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>

parent cf8e019b

drivers/xen/xenbus/xenbus_probe_frontend.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;