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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 15:05:03 +07:00
bdeeed0988
Loading a NuBus driver module on a non-NuBus machine triggers the
BUG_ON(!drv->bus->p) in driver_register(), because bus_register() was
not called, because it is conditional on MACH_IS_MAC.
Fix the crash by calling bus_register() unconditionally. Call it from
a postcore_initcall(), like other busses do.
Hence, the bus type is available for device_register(), which happens
in a subsys initcall, and for driver_register(), which happens in a
device or module initcall.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reported-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Stan Johnson <userm57@yahoo.com>
Fixes: 7f86c765a6 ("nubus: Add support for the driver model")
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Bus implementation for the NuBus subsystem.
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//
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// Copyright (C) 2017 Finn Thain
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/nubus.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#define to_nubus_board(d) container_of(d, struct nubus_board, dev)
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#define to_nubus_driver(d) container_of(d, struct nubus_driver, driver)
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static int nubus_bus_match(struct device *dev, struct device_driver *driver)
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{
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return 1;
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}
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static int nubus_device_probe(struct device *dev)
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{
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struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
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int err = -ENODEV;
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if (ndrv->probe)
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err = ndrv->probe(to_nubus_board(dev));
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return err;
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}
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static int nubus_device_remove(struct device *dev)
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{
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struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
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int err = -ENODEV;
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if (dev->driver && ndrv->remove)
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err = ndrv->remove(to_nubus_board(dev));
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return err;
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}
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struct bus_type nubus_bus_type = {
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.name = "nubus",
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.match = nubus_bus_match,
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.probe = nubus_device_probe,
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.remove = nubus_device_remove,
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};
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EXPORT_SYMBOL(nubus_bus_type);
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int nubus_driver_register(struct nubus_driver *ndrv)
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{
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ndrv->driver.bus = &nubus_bus_type;
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return driver_register(&ndrv->driver);
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}
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EXPORT_SYMBOL(nubus_driver_register);
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void nubus_driver_unregister(struct nubus_driver *ndrv)
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{
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driver_unregister(&ndrv->driver);
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}
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EXPORT_SYMBOL(nubus_driver_unregister);
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static struct device nubus_parent = {
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.init_name = "nubus",
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};
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static int __init nubus_bus_register(void)
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{
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return bus_register(&nubus_bus_type);
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}
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postcore_initcall(nubus_bus_register);
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int __init nubus_parent_device_register(void)
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{
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return device_register(&nubus_parent);
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}
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static void nubus_device_release(struct device *dev)
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{
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struct nubus_board *board = to_nubus_board(dev);
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struct nubus_rsrc *fres, *tmp;
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list_for_each_entry_safe(fres, tmp, &nubus_func_rsrcs, list)
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if (fres->board == board) {
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list_del(&fres->list);
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kfree(fres);
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}
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kfree(board);
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}
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int nubus_device_register(struct nubus_board *board)
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{
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board->dev.parent = &nubus_parent;
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board->dev.release = nubus_device_release;
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board->dev.bus = &nubus_bus_type;
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dev_set_name(&board->dev, "slot.%X", board->slot);
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return device_register(&board->dev);
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}
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static int nubus_print_device_name_fn(struct device *dev, void *data)
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{
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struct nubus_board *board = to_nubus_board(dev);
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struct seq_file *m = data;
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seq_printf(m, "Slot %X: %s\n", board->slot, board->name);
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return 0;
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}
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int nubus_proc_show(struct seq_file *m, void *data)
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{
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return bus_for_each_dev(&nubus_bus_type, NULL, m,
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nubus_print_device_name_fn);
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}
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