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In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki <rafael@kernel.org> Reviewed-by: Alex Elder <elder@kernel.org> Acked-by: Sumit Garg <sumit.garg@linaro.org> Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/*
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* TURBOchannel driver services.
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*
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* Copyright (c) 2005 James Simmons
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* Copyright (c) 2006 Maciej W. Rozycki
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*
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* Loosely based on drivers/dio/dio-driver.c and
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* drivers/pci/pci-driver.c.
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*
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* This file is subject to the terms and conditions of the GNU
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* General Public License. See the file "COPYING" in the main
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* directory of this archive for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/tc.h>
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/**
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* tc_register_driver - register a new TC driver
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* @drv: the driver structure to register
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*
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* Adds the driver structure to the list of registered drivers
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* Returns a negative value on error, otherwise 0.
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* If no error occurred, the driver remains registered even if
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* no device was claimed during registration.
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*/
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int tc_register_driver(struct tc_driver *tdrv)
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{
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return driver_register(&tdrv->driver);
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}
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EXPORT_SYMBOL(tc_register_driver);
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/**
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* tc_unregister_driver - unregister a TC driver
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* @drv: the driver structure to unregister
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*
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* Deletes the driver structure from the list of registered TC drivers,
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* gives it a chance to clean up by calling its remove() function for
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* each device it was responsible for, and marks those devices as
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* driverless.
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*/
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void tc_unregister_driver(struct tc_driver *tdrv)
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{
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driver_unregister(&tdrv->driver);
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}
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EXPORT_SYMBOL(tc_unregister_driver);
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/**
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* tc_match_device - tell if a TC device structure has a matching
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* TC device ID structure
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* @tdrv: the TC driver to earch for matching TC device ID strings
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* @tdev: the TC device structure to match against
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*
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* Used by a driver to check whether a TC device present in the
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* system is in its list of supported devices. Returns the matching
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* tc_device_id structure or %NULL if there is no match.
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*/
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static const struct tc_device_id *tc_match_device(const struct tc_driver *tdrv,
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struct tc_dev *tdev)
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{
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const struct tc_device_id *id = tdrv->id_table;
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if (id) {
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while (id->name[0] || id->vendor[0]) {
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if (strcmp(tdev->name, id->name) == 0 &&
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strcmp(tdev->vendor, id->vendor) == 0)
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return id;
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id++;
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}
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}
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return NULL;
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}
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/**
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* tc_bus_match - Tell if a device structure has a matching
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* TC device ID structure
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* @dev: the device structure to match against
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* @drv: the device driver to search for matching TC device ID strings
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*
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* Used by a driver to check whether a TC device present in the
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* system is in its list of supported devices. Returns 1 if there
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* is a match or 0 otherwise.
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*/
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static int tc_bus_match(struct device *dev, const struct device_driver *drv)
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{
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struct tc_dev *tdev = to_tc_dev(dev);
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const struct tc_driver *tdrv = to_tc_driver(drv);
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const struct tc_device_id *id;
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id = tc_match_device(tdrv, tdev);
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if (id)
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return 1;
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return 0;
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}
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const struct bus_type tc_bus_type = {
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.name = "tc",
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.match = tc_bus_match,
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};
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EXPORT_SYMBOL(tc_bus_type);
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static int __init tc_driver_init(void)
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{
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return bus_register(&tc_bus_type);
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}
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postcore_initcall(tc_driver_init);
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