[S390] pm: vmur driver power management callbacks
Signed-off-by: Frank Munzert <munzert@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -2,7 +2,7 @@
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* Linux driver for System z and s390 unit record devices
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* (z/VM virtual punch, reader, printer)
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*
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* Copyright IBM Corp. 2001, 2007
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* Copyright IBM Corp. 2001, 2009
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* Authors: Malcolm Beattie <beattiem@uk.ibm.com>
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* Michael Holzheu <holzheu@de.ibm.com>
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* Frank Munzert <munzert@de.ibm.com>
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@ -60,6 +60,7 @@ static int ur_probe(struct ccw_device *cdev);
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static void ur_remove(struct ccw_device *cdev);
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static int ur_set_online(struct ccw_device *cdev);
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static int ur_set_offline(struct ccw_device *cdev);
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static int ur_pm_suspend(struct ccw_device *cdev);
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static struct ccw_driver ur_driver = {
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.name = "vmur",
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@ -69,6 +70,7 @@ static struct ccw_driver ur_driver = {
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.remove = ur_remove,
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.set_online = ur_set_online,
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.set_offline = ur_set_offline,
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.freeze = ur_pm_suspend,
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};
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static DEFINE_MUTEX(vmur_mutex);
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@ -157,6 +159,28 @@ static void urdev_put(struct urdev *urd)
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urdev_free(urd);
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}
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/*
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* State and contents of ur devices can be changed by class D users issuing
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* CP commands such as PURGE or TRANSFER, while the Linux guest is suspended.
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* Also the Linux guest might be logged off, which causes all active spool
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* files to be closed.
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* So we cannot guarantee that spool files are still the same when the Linux
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* guest is resumed. In order to avoid unpredictable results at resume time
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* we simply refuse to suspend if a ur device node is open.
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*/
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static int ur_pm_suspend(struct ccw_device *cdev)
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{
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struct urdev *urd = cdev->dev.driver_data;
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TRACE("ur_pm_suspend: cdev=%p\n", cdev);
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if (urd->open_flag) {
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pr_err("Unit record device %s is busy, %s refusing to "
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"suspend.\n", dev_name(&cdev->dev), ur_banner);
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return -EBUSY;
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}
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return 0;
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}
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/*
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* Low-level functions to do I/O to a ur device.
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* alloc_chan_prog
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