diff options
Diffstat (limited to 'drivers/s390/char/vmlogrdr.c')
| -rw-r--r-- | drivers/s390/char/vmlogrdr.c | 27 |
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 |