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The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20231103171428.3636570-2-u.kleine-koenig@pengutronix.de 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_new = 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 vudc_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(vudc_init);
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static void __exit vudc_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(vudc_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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