# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID f5a5f49935fda0bb613275c614fc7462bff75ba3
# Parent 17e9daeb2c504389a8de8b5ed814bbe75878dca3
[XENBUS] Improve the code for waiting for devices to connect. Provide
a more useful error when devices fail to connect.
From: Mark McLoughlin <markmc@xxxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe.c | 45 ++++++++---------
1 files changed, 23 insertions(+), 22 deletions(-)
diff -r 17e9daeb2c50 -r f5a5f49935fd
linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe.c
--- a/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe.c Fri Jun 30
14:41:13 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe.c Fri Jun 30
17:02:22 2006 +0100
@@ -886,28 +886,18 @@ EXPORT_SYMBOL_GPL(unregister_xenstore_no
EXPORT_SYMBOL_GPL(unregister_xenstore_notifier);
-static int all_devices_ready_(struct device *dev, void *data)
+static int find_disconnected_device_(struct device *dev, void *data)
{
struct xenbus_device *xendev = to_xenbus_device(dev);
- int *result = data;
-
- if (xendev->state != XenbusStateConnected) {
- *result = 0;
- return 1;
- }
-
- return 0;
-}
-
-
-static int all_devices_ready(void)
-{
- int ready = 1;
- bus_for_each_dev(&xenbus_frontend.bus, NULL, &ready,
- all_devices_ready_);
- return ready;
-}
-
+
+ return (xendev->state == XenbusStateConnected) ? 0 : 1;
+}
+
+static struct device *find_disconnected_device(struct device *start)
+{
+ return bus_find_device(&xenbus_frontend.bus, start, NULL,
+ find_disconnected_device_);
+}
void xenbus_probe(void *unused)
{
@@ -1077,17 +1067,28 @@ static int __init wait_for_devices(void)
static int __init wait_for_devices(void)
{
unsigned long timeout = jiffies + 10*HZ;
+ struct device *dev = NULL;
+ struct xenbus_device *xendev;
if (!is_running_on_xen())
return -ENODEV;
while (time_before(jiffies, timeout)) {
- if (all_devices_ready())
+ if ((dev = find_disconnected_device(NULL)) == NULL)
return 0;
+ put_device(dev);
schedule_timeout_interruptible(HZ/10);
}
- printk(KERN_WARNING "XENBUS: Timeout connecting to devices!\n");
+ while (dev != NULL) {
+ xendev = to_xenbus_device(dev);
+
+ printk(KERN_WARNING "XENBUS: Timeout connecting to device:
%s\n",
+ xendev->nodename);
+
+ dev = find_disconnected_device(dev);
+ }
+
return 0;
}
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