[S390] pm: vmur driver power management callbacks (b241f7bc) · Commits · e / devices / android_kernel_teracube_emerald

drivers/s390/char/vmur.c

+25 −1

Original line number	Diff line number	Diff line
		@@ -2,7 +2,7 @@
		* Linux driver for System z and s390 unit record devices
		* (z/VM virtual punch, reader, printer)
		*
		* Copyright IBM Corp. 2001, 2007
		* Copyright IBM Corp. 2001, 2009
		* Authors: Malcolm Beattie <beattiem@uk.ibm.com>
		* Michael Holzheu <holzheu@de.ibm.com>
		* Frank Munzert <munzert@de.ibm.com>
		@@ -60,6 +60,7 @@ static int ur_probe(struct ccw_device *cdev);
		static void ur_remove(struct ccw_device *cdev);
		static int ur_set_online(struct ccw_device *cdev);
		static int ur_set_offline(struct ccw_device *cdev);
		static int ur_pm_suspend(struct ccw_device *cdev);

		static struct ccw_driver ur_driver = {
		.name = "vmur",
		@@ -69,6 +70,7 @@ static struct ccw_driver ur_driver = {
		.remove = ur_remove,
		.set_online = ur_set_online,
		.set_offline = ur_set_offline,
		.freeze = ur_pm_suspend,
		};

		static DEFINE_MUTEX(vmur_mutex);
		@@ -157,6 +159,28 @@ static void urdev_put(struct urdev *urd)
		urdev_free(urd);
		}

		/*
		* State and contents of ur devices can be changed by class D users issuing
		* CP commands such as PURGE or TRANSFER, while the Linux guest is suspended.
		* Also the Linux guest might be logged off, which causes all active spool
		* files to be closed.
		* So we cannot guarantee that spool files are still the same when the Linux
		* guest is resumed. In order to avoid unpredictable results at resume time
		* we simply refuse to suspend if a ur device node is open.
		*/
		static int ur_pm_suspend(struct ccw_device *cdev)
		{
		struct urdev *urd = cdev->dev.driver_data;

		TRACE("ur_pm_suspend: cdev=%p\n", cdev);
		if (urd->open_flag) {
		pr_err("Unit record device %s is busy, %s refusing to "
		"suspend.\n", dev_name(&cdev->dev), ur_banner);
		return -EBUSY;
		}
		return 0;
		}

		/*
		* Low-level functions to do I/O to a ur device.
		* alloc_chan_prog