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4378e427f7
Replace "struct list_head head = LIST_HEAD_INIT(head)" with "LIST_HEAD(head)" to simplify the code. LIST_HEAD() helps to clean up the code "struct list_head vudc_devices =", only to care about the variable 'vudc_devices'. Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Cai Huoqing <cai.huoqing@linux.dev> Link: https://lore.kernel.org/r/20220211012807.7415-1-cai.huoqing@linux.dev Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
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* Copyright (C) 2015-2016 Samsung Electronics
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* Igor Kotrasinski <i.kotrasinsk@samsung.com>
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* Krzysztof Opasiak <k.opasiak@samsung.com>
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*/
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include "vudc.h"
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static unsigned int vudc_number = 1;
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module_param_named(num, vudc_number, uint, S_IRUGO);
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MODULE_PARM_DESC(num, "number of emulated controllers");
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static struct platform_driver vudc_driver = {
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.probe = vudc_probe,
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.remove = vudc_remove,
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.driver = {
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.name = GADGET_NAME,
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.dev_groups = vudc_groups,
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},
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};
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static LIST_HEAD(vudc_devices);
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static int __init init(void)
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{
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int retval = -ENOMEM;
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int i;
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struct vudc_device *udc_dev = NULL, *udc_dev2 = NULL;
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if (usb_disabled())
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return -ENODEV;
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if (vudc_number < 1) {
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pr_err("Number of emulated UDC must be no less than 1");
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return -EINVAL;
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}
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retval = platform_driver_register(&vudc_driver);
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if (retval < 0)
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goto out;
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for (i = 0; i < vudc_number; i++) {
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udc_dev = alloc_vudc_device(i);
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if (!udc_dev) {
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retval = -ENOMEM;
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goto cleanup;
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}
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retval = platform_device_add(udc_dev->pdev);
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if (retval < 0) {
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put_vudc_device(udc_dev);
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goto cleanup;
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}
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list_add_tail(&udc_dev->dev_entry, &vudc_devices);
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if (!platform_get_drvdata(udc_dev->pdev)) {
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/*
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* The udc was added successfully but its probe
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* function failed for some reason.
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*/
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retval = -EINVAL;
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goto cleanup;
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}
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}
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goto out;
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cleanup:
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list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
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list_del(&udc_dev->dev_entry);
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/*
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* Just do platform_device_del() here, put_vudc_device()
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* calls the platform_device_put()
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*/
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platform_device_del(udc_dev->pdev);
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put_vudc_device(udc_dev);
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}
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platform_driver_unregister(&vudc_driver);
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out:
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return retval;
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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struct vudc_device *udc_dev = NULL, *udc_dev2 = NULL;
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list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
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list_del(&udc_dev->dev_entry);
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/*
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* Just do platform_device_del() here, put_vudc_device()
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* calls the platform_device_put()
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*/
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platform_device_del(udc_dev->pdev);
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put_vudc_device(udc_dev);
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}
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platform_driver_unregister(&vudc_driver);
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}
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module_exit(cleanup);
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MODULE_DESCRIPTION("USB over IP Device Controller");
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MODULE_AUTHOR("Krzysztof Opasiak, Karol Kosik, Igor Kotrasinski");
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MODULE_LICENSE("GPL");
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