[S390] pm: vmlogrdr power management callbacks

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 26 insertions, 1 deletions

diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
index d8a2289fcb69..e925808c2149 100644
--- a/drivers/s390/char/vmlogrdr.c
+++ b/drivers/s390/char/vmlogrdr.c
@@ -3,7 +3,7 @@
  *      character device driver for reading z/VM system service records
  *
  *
- *      Copyright 2004 IBM Corporation
+ *      Copyright IBM Corp. 2004, 2009
  *      character device driver for reading z/VM system service records,
  *      Version 1.0
  *      Author(s): Xenia Tkatschow <xenia@us.ibm.com>
@@ -660,6 +660,29 @@ static struct attribute *vmlogrdr_attrs[] = {
         NULL,
 };
 
+static int vmlogrdr_pm_prepare(struct device *dev)
+{
+        int rc;
+        struct vmlogrdr_priv_t *priv = dev->driver_data;
+
+        rc = 0;
+        if (priv) {
+                spin_lock_bh(&priv->priv_lock);
+                if (priv->dev_in_use)
+                        rc = -EBUSY;
+                spin_unlock_bh(&priv->priv_lock);
+        }
+        if (rc)
+                pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n",
+                       dev_name(dev));
+        return rc;
+}
+
+
+static struct dev_pm_ops vmlogrdr_pm_ops = {
+        .prepare = vmlogrdr_pm_prepare,
+};
+
 static struct attribute_group vmlogrdr_attr_group = {
         .attrs = vmlogrdr_attrs,
 };
@@ -668,6 +691,7 @@ static struct class *vmlogrdr_class;
 static struct device_driver vmlogrdr_driver = {
         .name = "vmlogrdr",
         .bus  = &iucv_bus,
+        .pm = &vmlogrdr_pm_ops,
 };
 
 
@@ -729,6 +753,7 @@ static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
                 dev->bus = &iucv_bus;
                 dev->parent = iucv_root;
                 dev->driver = &vmlogrdr_driver;
+                dev->driver_data = priv;
                 /*
                  * The release function could be called after the
                  * module has been unloaded. It's _only_ task is to