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authorStefan Weinhuber <wein@de.ibm.com>2009-06-16 12:30:38 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-16 12:31:15 +0400
commit9f62fa1618987e9fadb2eef86d35ef168ddf5a1f (patch)
tree34f269f035be00fc0c96c61339e199e22972c2bd /drivers/s390/char/vmlogrdr.c
parentb241f7bcc603babd3de903fa855d418ee7c4751d (diff)
downloadlinux-9f62fa1618987e9fadb2eef86d35ef168ddf5a1f.tar.xz
[S390] pm: vmlogrdr power management callbacks
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/vmlogrdr.c')
-rw-r--r--drivers/s390/char/vmlogrdr.c27
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