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520776557b
Since commit 43a7206b09 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the tape_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: "Ricardo B. Marliere" <ricardo@marliere.net>
Link: https://lore.kernel.org/r/20240305-class_cleanup-s390-v1-4-c4ff1ec49ffd@marliere.net
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2004
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*
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* Tape class device support
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*
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* Author: Stefan Bader <shbader@de.ibm.com>
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* Based on simple class device code by Greg K-H
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*/
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#define KMSG_COMPONENT "tape"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/slab.h>
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#include "tape_class.h"
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MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
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MODULE_DESCRIPTION(
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"Copyright IBM Corp. 2004 All Rights Reserved.\n"
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"tape_class.c"
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);
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MODULE_LICENSE("GPL");
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static const struct class tape_class = {
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.name = "tape390",
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};
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/*
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* Register a tape device and return a pointer to the cdev structure.
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*
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* device
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* The pointer to the struct device of the physical (base) device.
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* drivername
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* The pointer to the drivers name for it's character devices.
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* dev
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* The intended major/minor number. The major number may be 0 to
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* get a dynamic major number.
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* fops
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* The pointer to the drivers file operations for the tape device.
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* devname
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* The pointer to the name of the character device.
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*/
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struct tape_class_device *register_tape_dev(
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struct device * device,
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dev_t dev,
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const struct file_operations *fops,
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char * device_name,
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char * mode_name)
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{
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struct tape_class_device * tcd;
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int rc;
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char * s;
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tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
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if (!tcd)
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return ERR_PTR(-ENOMEM);
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strscpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
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for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
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*s = '!';
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strscpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
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for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
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*s = '!';
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tcd->char_device = cdev_alloc();
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if (!tcd->char_device) {
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rc = -ENOMEM;
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goto fail_with_tcd;
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}
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tcd->char_device->owner = fops->owner;
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tcd->char_device->ops = fops;
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rc = cdev_add(tcd->char_device, dev, 1);
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if (rc)
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goto fail_with_cdev;
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tcd->class_device = device_create(&tape_class, device,
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tcd->char_device->dev, NULL,
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"%s", tcd->device_name);
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rc = PTR_ERR_OR_ZERO(tcd->class_device);
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if (rc)
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goto fail_with_cdev;
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rc = sysfs_create_link(
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&device->kobj,
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&tcd->class_device->kobj,
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tcd->mode_name
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);
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if (rc)
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goto fail_with_class_device;
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return tcd;
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fail_with_class_device:
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device_destroy(&tape_class, tcd->char_device->dev);
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fail_with_cdev:
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cdev_del(tcd->char_device);
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fail_with_tcd:
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kfree(tcd);
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return ERR_PTR(rc);
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}
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EXPORT_SYMBOL(register_tape_dev);
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void unregister_tape_dev(struct device *device, struct tape_class_device *tcd)
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{
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if (tcd != NULL && !IS_ERR(tcd)) {
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sysfs_remove_link(&device->kobj, tcd->mode_name);
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device_destroy(&tape_class, tcd->char_device->dev);
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cdev_del(tcd->char_device);
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kfree(tcd);
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}
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}
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EXPORT_SYMBOL(unregister_tape_dev);
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static int __init tape_init(void)
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{
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return class_register(&tape_class);
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}
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static void __exit tape_exit(void)
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{
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class_unregister(&tape_class);
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}
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postcore_initcall(tape_init);
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module_exit(tape_exit);
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