[S390] pm: vmlogrdr power management callbacks
Stefan Weinhuber [Tue, 16 Jun 2009 08:30:38 +0000 (10:30 +0200)]
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/vmlogrdr.c

index d8a2289..e925808 100644 (file)
@@ -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