xen: xenbus PM events support
Make xenbus frontend device subscribe to PM events
to receive suspend/resume/freeze/thaw/restore
notifications.
Signed-off-by: Kenji Wakamiya <wkenji@jp.fujitsu.com>
Signed-off-by: Kazuhiro Suzuki <kaz@jp.fujitsu.com>
Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
[shriram--minor mods and improved commit message]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index baa65e7..7397695 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -577,7 +577,7 @@
}
EXPORT_SYMBOL_GPL(xenbus_dev_changed);
-int xenbus_dev_suspend(struct device *dev, pm_message_t state)
+int xenbus_dev_suspend(struct device *dev)
{
int err = 0;
struct xenbus_driver *drv;
@@ -590,7 +590,7 @@
return 0;
drv = to_xenbus_driver(dev->driver);
if (drv->suspend)
- err = drv->suspend(xdev, state);
+ err = drv->suspend(xdev);
if (err)
printk(KERN_WARNING
"xenbus: suspend %s failed: %i\n", dev_name(dev), err);
@@ -642,6 +642,14 @@
}
EXPORT_SYMBOL_GPL(xenbus_dev_resume);
+int xenbus_dev_cancel(struct device *dev)
+{
+ /* Do nothing */
+ DPRINTK("cancel");
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xenbus_dev_cancel);
+
/* A flag to determine if xenstored is 'ready' (i.e. has started) */
int xenstored_ready = 0;
diff --git a/drivers/xen/xenbus/xenbus_probe.h b/drivers/xen/xenbus/xenbus_probe.h
index 2466581..888b990 100644
--- a/drivers/xen/xenbus/xenbus_probe.h
+++ b/drivers/xen/xenbus/xenbus_probe.h
@@ -64,8 +64,9 @@
extern void xenbus_dev_shutdown(struct device *_dev);
-extern int xenbus_dev_suspend(struct device *dev, pm_message_t state);
+extern int xenbus_dev_suspend(struct device *dev);
extern int xenbus_dev_resume(struct device *dev);
+extern int xenbus_dev_cancel(struct device *dev);
extern void xenbus_otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len,
diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c
index 5bcc2d6..ea83999 100644
--- a/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -85,6 +85,12 @@
__ATTR_NULL
};
+static const struct dev_pm_ops xenbus_pm_ops = {
+ .suspend = xenbus_dev_suspend,
+ .resume = xenbus_dev_resume,
+ .thaw = xenbus_dev_cancel,
+};
+
static struct xen_bus_type xenbus_frontend = {
.root = "device",
.levels = 2, /* device/type/<id> */
@@ -100,8 +106,7 @@
.shutdown = xenbus_dev_shutdown,
.dev_attrs = xenbus_frontend_dev_attrs,
- .suspend = xenbus_dev_suspend,
- .resume = xenbus_dev_resume,
+ .pm = &xenbus_pm_ops,
},
};