xen: fix is_disconnected_device/exists_disconnected_device
The logic of is_disconnected_device/exists_disconnected_device is wrong
in that they are used to test whether a device is trying to connect (i.e.
connecting). For this reason the patch fixes them to not consider a
Closing or Closed device to be connecting. At the same time the patch
also renames the functions according to what they really do; you could
say a closed device is "disconnected" (the old name), but not "connecting"
(the new name).
This patch is a backport of changeset 909 from the Xenbits tree.
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 3800da7..19bce3e 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -843,7 +843,7 @@
MODULE_LICENSE("GPL");
-static int is_disconnected_device(struct device *dev, void *data)
+static int is_device_connecting(struct device *dev, void *data)
{
struct xenbus_device *xendev = to_xenbus_device(dev);
struct device_driver *drv = data;
@@ -861,14 +861,15 @@
return 0;
xendrv = to_xenbus_driver(dev->driver);
- return (xendev->state != XenbusStateConnected ||
- (xendrv->is_ready && !xendrv->is_ready(xendev)));
+ return (xendev->state < XenbusStateConnected ||
+ (xendev->state == XenbusStateConnected &&
+ xendrv->is_ready && !xendrv->is_ready(xendev)));
}
-static int exists_disconnected_device(struct device_driver *drv)
+static int exists_connecting_device(struct device_driver *drv)
{
return bus_for_each_dev(&xenbus_frontend.bus, NULL, drv,
- is_disconnected_device);
+ is_device_connecting);
}
static int print_device_status(struct device *dev, void *data)
@@ -918,7 +919,7 @@
if (!ready_to_wait_for_devices || !xen_domain())
return;
- while (exists_disconnected_device(drv)) {
+ while (exists_connecting_device(drv)) {
if (time_after(jiffies, timeout))
break;
schedule_timeout_interruptible(HZ/10);