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07bfd4abdc
The driver explicitly sets the .driver_data member of struct pnp_device_id to zero without relying on that value. Drop these unused assignments. While touching this array simplify the list terminator and align the the array's coding style to what is used most for these. This patch doesn't modify the compiled array, only its representation in source form benefits. The former was confirmed with builds on x86 and arm64. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/0484b30b6935994f5a2d97c55a47a95e1557dd15.1781102535.git.u.kleine-koenig@baylibre.com Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* system.c - a driver for reserving pnp system resources
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*
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* Some code is based on pnpbios_core.c
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#include <linux/pnp.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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static const struct pnp_device_id pnp_dev_table[] = {
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/* General ID for reserving resources */
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{ .id = "PNP0c02" },
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/* memory controller */
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{ .id = "PNP0c01" },
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{ }
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};
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static void reserve_range(struct pnp_dev *dev, struct resource *r, int port)
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{
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char *regionid;
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const char *pnpid = dev_name(&dev->dev);
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resource_size_t start = r->start, end = r->end;
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struct resource *res;
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regionid = kmalloc(16, GFP_KERNEL);
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if (!regionid)
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return;
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snprintf(regionid, 16, "pnp %s", pnpid);
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if (port)
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res = request_region(start, end - start + 1, regionid);
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else
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res = request_mem_region(start, end - start + 1, regionid);
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if (res)
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res->flags &= ~IORESOURCE_BUSY;
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else
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kfree(regionid);
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/*
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* Failures at this point are usually harmless. pci quirks for
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* example do reserve stuff they know about too, so we may well
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* have double reservations.
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*/
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dev_info(&dev->dev, "%pR %s reserved\n", r,
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res ? "has been" : "could not be");
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}
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static void reserve_resources_of_dev(struct pnp_dev *dev)
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{
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struct resource *res;
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int i;
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for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
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if (res->flags & IORESOURCE_DISABLED)
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continue;
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if (res->start == 0)
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continue; /* disabled */
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if (res->start < 0x100)
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/*
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* Below 0x100 is only standard PC hardware
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* (pics, kbd, timer, dma, ...)
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* We should not get resource conflicts there,
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* and the kernel reserves these anyway
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* (see arch/i386/kernel/setup.c).
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* So, do nothing
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*/
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continue;
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if (res->end < res->start)
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continue; /* invalid */
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reserve_range(dev, res, 1);
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}
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for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
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if (res->flags & IORESOURCE_DISABLED)
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continue;
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reserve_range(dev, res, 0);
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}
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}
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static int system_pnp_probe(struct pnp_dev *dev,
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const struct pnp_device_id *dev_id)
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{
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reserve_resources_of_dev(dev);
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return 0;
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}
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static struct pnp_driver system_pnp_driver = {
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.name = "system",
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.id_table = pnp_dev_table,
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.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
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.probe = system_pnp_probe,
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};
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static int __init pnp_system_init(void)
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{
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return pnp_register_driver(&system_pnp_driver);
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}
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/*
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* Reserve motherboard resources after PCI claim BARs,
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* but before PCI assign resources for uninitialized PCI devices
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*/
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fs_initcall(pnp_system_init);
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