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[S390] pm: vmlogrdr power management callbacks 

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Weinhuber 2009-06-16 10:30:38 +02:00 committed by Martin Schwidefsky
parent b241f7bcc6
commit 9f62fa1618
1 changed files with 26 additions and 1 deletions
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27
drivers/s390/char/vmlogrdr.c
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@ -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