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path: root/drivers/s390/char/vmur.c
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Diffstat (limited to 'drivers/s390/char/vmur.c')
-rw-r--r--drivers/s390/char/vmur.c84
1 files changed, 55 insertions, 29 deletions
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
index 5dcef81fc9d..0efb27f6f19 100644
--- a/drivers/s390/char/vmur.c
+++ b/drivers/s390/char/vmur.c
@@ -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>
@@ -12,7 +12,8 @@
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/cdev.h>
-#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/module.h>
#include <asm/uaccess.h>
#include <asm/cio.h>
@@ -60,15 +61,20 @@ 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",
- .owner = THIS_MODULE,
+ .driver = {
+ .name = "vmur",
+ .owner = THIS_MODULE,
+ },
.ids = ur_ids,
.probe = ur_probe,
.remove = ur_remove,
.set_online = ur_set_online,
.set_offline = ur_set_offline,
+ .freeze = ur_pm_suspend,
+ .int_class = IRQIO_VMR,
};
static DEFINE_MUTEX(vmur_mutex);
@@ -78,19 +84,19 @@ static DEFINE_MUTEX(vmur_mutex);
*
* Each ur device (urd) contains a reference to its corresponding ccw device
* (cdev) using the urd->cdev pointer. Each ccw device has a reference to the
- * ur device using the cdev->dev.driver_data pointer.
+ * ur device using dev_get_drvdata(&cdev->dev) pointer.
*
* urd references:
* - ur_probe gets a urd reference, ur_remove drops the reference
- * (cdev->dev.driver_data)
- * - ur_open gets a urd reference, ur_relase drops the reference
+ * dev_get_drvdata(&cdev->dev)
+ * - ur_open gets a urd reference, ur_release drops the reference
* (urf->urd)
*
* cdev references:
* - urdev_alloc get a cdev reference (urd->cdev)
* - urdev_free drops the cdev reference (urd->cdev)
*
- * Setting and clearing of cdev->dev.driver_data is protected by the ccwdev lock
+ * Setting and clearing of dev_get_drvdata(&cdev->dev) is protected by the ccwdev lock
*/
static struct urdev *urdev_alloc(struct ccw_device *cdev)
{
@@ -129,7 +135,7 @@ static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev)
unsigned long flags;
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- urd = cdev->dev.driver_data;
+ urd = dev_get_drvdata(&cdev->dev);
if (urd)
urdev_get(urd);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
@@ -158,6 +164,28 @@ static void urdev_put(struct urdev *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 = dev_get_drvdata(&cdev->dev);
+
+ 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
* free_chan_prog
@@ -286,7 +314,7 @@ static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
TRACE("ur_int_handler: unsolicited interrupt\n");
return;
}
- urd = cdev->dev.driver_data;
+ urd = dev_get_drvdata(&cdev->dev);
BUG_ON(!urd);
/* On special conditions irb is an error pointer */
if (IS_ERR(irb))
@@ -671,12 +699,11 @@ static int ur_open(struct inode *inode, struct file *file)
if (accmode == O_RDWR)
return -EACCES;
- lock_kernel();
/*
* We treat the minor number as the devno of the ur device
* to find in the driver tree.
*/
- devno = MINOR(file->f_dentry->d_inode->i_rdev);
+ devno = MINOR(file_inode(file)->i_rdev);
urd = urdev_get_from_devno(devno);
if (!urd) {
@@ -725,7 +752,6 @@ static int ur_open(struct inode *inode, struct file *file)
goto fail_urfile_free;
urf->file_reclen = rc;
file->private_data = urf;
- unlock_kernel();
return 0;
fail_urfile_free:
@@ -737,7 +763,6 @@ fail_unlock:
fail_put:
urdev_put(urd);
out:
- unlock_kernel();
return rc;
}
@@ -832,7 +857,7 @@ static int ur_probe(struct ccw_device *cdev)
goto fail_remove_attr;
}
spin_lock_irq(get_ccwdev_lock(cdev));
- cdev->dev.driver_data = urd;
+ dev_set_drvdata(&cdev->dev, urd);
spin_unlock_irq(get_ccwdev_lock(cdev));
mutex_unlock(&vmur_mutex);
@@ -878,7 +903,7 @@ static int ur_set_online(struct ccw_device *cdev)
goto fail_urdev_put;
}
- cdev_init(urd->char_device, &ur_fops);
+ urd->char_device->ops = &ur_fops;
urd->char_device->dev = MKDEV(major, minor);
urd->char_device->owner = ur_fops.owner;
@@ -897,8 +922,8 @@ static int ur_set_online(struct ccw_device *cdev)
goto fail_free_cdev;
}
- urd->device = device_create(vmur_class, NULL, urd->char_device->dev,
- NULL, "%s", node_id);
+ urd->device = device_create(vmur_class, &cdev->dev,
+ urd->char_device->dev, NULL, "%s", node_id);
if (IS_ERR(urd->device)) {
rc = PTR_ERR(urd->device);
TRACE("ur_set_online: device_create rc=%d\n", rc);
@@ -972,8 +997,8 @@ static void ur_remove(struct ccw_device *cdev)
ur_remove_attributes(&cdev->dev);
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- urdev_put(cdev->dev.driver_data);
- cdev->dev.driver_data = NULL;
+ urdev_put(dev_get_drvdata(&cdev->dev));
+ dev_set_drvdata(&cdev->dev, NULL);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
mutex_unlock(&vmur_mutex);
@@ -1002,9 +1027,15 @@ static int __init ur_init(void)
debug_set_level(vmur_dbf, 6);
+ vmur_class = class_create(THIS_MODULE, "vmur");
+ if (IS_ERR(vmur_class)) {
+ rc = PTR_ERR(vmur_class);
+ goto fail_free_dbf;
+ }
+
rc = ccw_driver_register(&ur_driver);
if (rc)
- goto fail_free_dbf;
+ goto fail_class_destroy;
rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur");
if (rc) {
@@ -1014,18 +1045,13 @@ static int __init ur_init(void)
}
ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0);
- vmur_class = class_create(THIS_MODULE, "vmur");
- if (IS_ERR(vmur_class)) {
- rc = PTR_ERR(vmur_class);
- goto fail_unregister_region;
- }
pr_info("%s loaded.\n", ur_banner);
return 0;
-fail_unregister_region:
- unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
fail_unregister_driver:
ccw_driver_unregister(&ur_driver);
+fail_class_destroy:
+ class_destroy(vmur_class);
fail_free_dbf:
debug_unregister(vmur_dbf);
return rc;
@@ -1033,9 +1059,9 @@ fail_free_dbf:
static void __exit ur_exit(void)
{
- class_destroy(vmur_class);
unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
ccw_driver_unregister(&ur_driver);
+ class_destroy(vmur_class);
debug_unregister(vmur_dbf);
pr_info("%s unloaded.\n", ur_banner);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 20:34:53 +0000