mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 04:36:40 +07:00
39acbc12af
In this patch: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=16dc42e018c2868211b4928f20a957c0c216126c the check was added for another driver to already claim the same device on the same bus. But the returned error code was wrong: to modprobe, the -EEXIST means that _this_ driver is already installed. It therefore doesn't produce the needed error message when _another_ driver is trying to register for the same device. Returning -EBUSY fixes the problem. Signed-off-by: Stas Sergeev <stsp@aknet.ru> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
291 lines
6.8 KiB
C
291 lines
6.8 KiB
C
/*
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* driver.c - centralized device driver management
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*
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* Copyright (c) 2002-3 Patrick Mochel
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* Copyright (c) 2002-3 Open Source Development Labs
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* Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (c) 2007 Novell Inc.
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include "base.h"
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static struct device *next_device(struct klist_iter *i)
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{
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struct klist_node *n = klist_next(i);
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struct device *dev = NULL;
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struct device_private *dev_prv;
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if (n) {
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dev_prv = to_device_private_driver(n);
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dev = dev_prv->device;
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}
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return dev;
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}
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/**
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* driver_for_each_device - Iterator for devices bound to a driver.
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* @drv: Driver we're iterating.
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* @start: Device to begin with
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* @data: Data to pass to the callback.
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* @fn: Function to call for each device.
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*
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* Iterate over the @drv's list of devices calling @fn for each one.
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*/
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int driver_for_each_device(struct device_driver *drv, struct device *start,
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void *data, int (*fn)(struct device *, void *))
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{
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struct klist_iter i;
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struct device *dev;
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int error = 0;
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if (!drv)
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return -EINVAL;
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klist_iter_init_node(&drv->p->klist_devices, &i,
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start ? &start->p->knode_driver : NULL);
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while ((dev = next_device(&i)) && !error)
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error = fn(dev, data);
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klist_iter_exit(&i);
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return error;
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}
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EXPORT_SYMBOL_GPL(driver_for_each_device);
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/**
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* driver_find_device - device iterator for locating a particular device.
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* @drv: The device's driver
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* @start: Device to begin with
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* @data: Data to pass to match function
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* @match: Callback function to check device
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*
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* This is similar to the driver_for_each_device() function above, but
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* it returns a reference to a device that is 'found' for later use, as
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* determined by the @match callback.
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*
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* The callback should return 0 if the device doesn't match and non-zero
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* if it does. If the callback returns non-zero, this function will
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* return to the caller and not iterate over any more devices.
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*/
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struct device *driver_find_device(struct device_driver *drv,
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struct device *start, void *data,
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int (*match)(struct device *dev, void *data))
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{
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struct klist_iter i;
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struct device *dev;
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if (!drv)
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return NULL;
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klist_iter_init_node(&drv->p->klist_devices, &i,
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(start ? &start->p->knode_driver : NULL));
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while ((dev = next_device(&i)))
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if (match(dev, data) && get_device(dev))
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break;
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klist_iter_exit(&i);
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return dev;
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}
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EXPORT_SYMBOL_GPL(driver_find_device);
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/**
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* driver_create_file - create sysfs file for driver.
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* @drv: driver.
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* @attr: driver attribute descriptor.
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*/
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int driver_create_file(struct device_driver *drv,
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struct driver_attribute *attr)
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{
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int error;
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if (drv)
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error = sysfs_create_file(&drv->p->kobj, &attr->attr);
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else
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error = -EINVAL;
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return error;
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}
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EXPORT_SYMBOL_GPL(driver_create_file);
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/**
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* driver_remove_file - remove sysfs file for driver.
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* @drv: driver.
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* @attr: driver attribute descriptor.
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*/
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void driver_remove_file(struct device_driver *drv,
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struct driver_attribute *attr)
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{
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if (drv)
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sysfs_remove_file(&drv->p->kobj, &attr->attr);
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}
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EXPORT_SYMBOL_GPL(driver_remove_file);
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/**
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* driver_add_kobj - add a kobject below the specified driver
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* @drv: requesting device driver
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* @kobj: kobject to add below this driver
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* @fmt: format string that names the kobject
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*
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* You really don't want to do this, this is only here due to one looney
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* iseries driver, go poke those developers if you are annoyed about
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* this...
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*/
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int driver_add_kobj(struct device_driver *drv, struct kobject *kobj,
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const char *fmt, ...)
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{
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va_list args;
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char *name;
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int ret;
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va_start(args, fmt);
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name = kvasprintf(GFP_KERNEL, fmt, args);
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va_end(args);
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if (!name)
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return -ENOMEM;
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ret = kobject_add(kobj, &drv->p->kobj, "%s", name);
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kfree(name);
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return ret;
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}
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EXPORT_SYMBOL_GPL(driver_add_kobj);
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/**
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* get_driver - increment driver reference count.
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* @drv: driver.
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*/
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struct device_driver *get_driver(struct device_driver *drv)
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{
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if (drv) {
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struct driver_private *priv;
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struct kobject *kobj;
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kobj = kobject_get(&drv->p->kobj);
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priv = to_driver(kobj);
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return priv->driver;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(get_driver);
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/**
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* put_driver - decrement driver's refcount.
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* @drv: driver.
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*/
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void put_driver(struct device_driver *drv)
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{
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kobject_put(&drv->p->kobj);
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}
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EXPORT_SYMBOL_GPL(put_driver);
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static int driver_add_groups(struct device_driver *drv,
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const struct attribute_group **groups)
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{
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int error = 0;
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int i;
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if (groups) {
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for (i = 0; groups[i]; i++) {
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error = sysfs_create_group(&drv->p->kobj, groups[i]);
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if (error) {
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while (--i >= 0)
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sysfs_remove_group(&drv->p->kobj,
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groups[i]);
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break;
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}
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}
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}
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return error;
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}
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static void driver_remove_groups(struct device_driver *drv,
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const struct attribute_group **groups)
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{
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int i;
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if (groups)
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for (i = 0; groups[i]; i++)
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sysfs_remove_group(&drv->p->kobj, groups[i]);
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}
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/**
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* driver_register - register driver with bus
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* @drv: driver to register
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*
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* We pass off most of the work to the bus_add_driver() call,
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* since most of the things we have to do deal with the bus
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* structures.
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*/
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int driver_register(struct device_driver *drv)
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{
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int ret;
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struct device_driver *other;
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BUG_ON(!drv->bus->p);
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if ((drv->bus->probe && drv->probe) ||
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(drv->bus->remove && drv->remove) ||
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(drv->bus->shutdown && drv->shutdown))
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printk(KERN_WARNING "Driver '%s' needs updating - please use "
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"bus_type methods\n", drv->name);
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other = driver_find(drv->name, drv->bus);
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if (other) {
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put_driver(other);
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printk(KERN_ERR "Error: Driver '%s' is already registered, "
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"aborting...\n", drv->name);
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return -EBUSY;
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}
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ret = bus_add_driver(drv);
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if (ret)
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return ret;
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ret = driver_add_groups(drv, drv->groups);
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if (ret)
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bus_remove_driver(drv);
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return ret;
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}
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EXPORT_SYMBOL_GPL(driver_register);
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/**
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* driver_unregister - remove driver from system.
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* @drv: driver.
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*
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* Again, we pass off most of the work to the bus-level call.
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*/
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void driver_unregister(struct device_driver *drv)
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{
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if (!drv || !drv->p) {
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WARN(1, "Unexpected driver unregister!\n");
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return;
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}
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driver_remove_groups(drv, drv->groups);
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bus_remove_driver(drv);
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}
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EXPORT_SYMBOL_GPL(driver_unregister);
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/**
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* driver_find - locate driver on a bus by its name.
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* @name: name of the driver.
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* @bus: bus to scan for the driver.
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*
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* Call kset_find_obj() to iterate over list of drivers on
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* a bus to find driver by name. Return driver if found.
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*
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* Note that kset_find_obj increments driver's reference count.
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*/
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struct device_driver *driver_find(const char *name, struct bus_type *bus)
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{
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struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
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struct driver_private *priv;
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if (k) {
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priv = to_driver(k);
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return priv->driver;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(driver_find);
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