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e4865a56d0
Since every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence. Accordingly, add requisite ACPI_COMPANION() or ACPI_HANDLE() checks against NULL to 13 platform drivers handling core ACPI devices. Also change the value returned by the ACPI thermal zone driver when the device's ACPI companion is not present to -ENODEV for consistency with the other drivers. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/4516068.ejJDZkT8p0@rafael.j.wysocki Cc: 7.0+ <stable@vger.kernel.org> # 7.0+
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ACPI Hardware Error Device (PNP0C33) Driver
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*
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* Copyright (C) 2010, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* ACPI Hardware Error Device is used to report some hardware errors
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* notified via SCI, mainly the corrected errors.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#include <acpi/hed.h>
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static const struct acpi_device_id acpi_hed_ids[] = {
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{"PNP0C33", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
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static acpi_handle hed_handle;
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static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
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int register_acpi_hed_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
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}
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EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
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void unregister_acpi_hed_notifier(struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
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/*
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* SCI to report hardware error is forwarded to the listeners of HED,
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* it is used by HEST Generic Hardware Error Source with notify type
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* SCI.
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*/
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static void acpi_hed_notify(acpi_handle handle, u32 event, void *data)
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{
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blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
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}
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static int acpi_hed_probe(struct platform_device *pdev)
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{
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struct acpi_device *device;
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int err;
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device = ACPI_COMPANION(&pdev->dev);
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if (!device)
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return -ENODEV;
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/* Only one hardware error device */
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if (hed_handle)
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return -EINVAL;
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hed_handle = device->handle;
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err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
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acpi_hed_notify, device);
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if (err)
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hed_handle = NULL;
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return err;
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}
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static void acpi_hed_remove(struct platform_device *pdev)
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{
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
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acpi_hed_notify);
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hed_handle = NULL;
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}
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static struct platform_driver acpi_hed_driver = {
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.probe = acpi_hed_probe,
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.remove = acpi_hed_remove,
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.driver = {
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.name = "acpi-hardware-error-device",
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.acpi_match_table = acpi_hed_ids,
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},
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};
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static int __init acpi_hed_driver_init(void)
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{
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return platform_driver_register(&acpi_hed_driver);
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}
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subsys_initcall(acpi_hed_driver_init);
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MODULE_AUTHOR("Huang Ying");
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MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
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MODULE_LICENSE("GPL");
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