forked from mirrors/linux
53c165e0a6
One of the changes in the attribute_container code in the scsi-misc tree was to add a lock to protect the list of devices per container. This, unfortunately, leads to potential scheduling while atomic problems if there's a sleep in the function called by a trigger. The correct solution is to use the kernel klist infrastructure instead which allows lockless traversal of a list. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/*
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* class_container.h - a generic container for all classes
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*
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* Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
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*
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* This file is licensed under GPLv2
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*/
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#ifndef _ATTRIBUTE_CONTAINER_H_
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#define _ATTRIBUTE_CONTAINER_H_
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/klist.h>
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#include <linux/spinlock.h>
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struct attribute_container {
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struct list_head node;
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struct klist containers;
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struct class *class;
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struct class_device_attribute **attrs;
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int (*match)(struct attribute_container *, struct device *);
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#define ATTRIBUTE_CONTAINER_NO_CLASSDEVS 0x01
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unsigned long flags;
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};
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static inline int
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attribute_container_no_classdevs(struct attribute_container *atc)
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{
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return atc->flags & ATTRIBUTE_CONTAINER_NO_CLASSDEVS;
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}
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static inline void
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attribute_container_set_no_classdevs(struct attribute_container *atc)
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{
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atc->flags |= ATTRIBUTE_CONTAINER_NO_CLASSDEVS;
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}
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int attribute_container_register(struct attribute_container *cont);
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int attribute_container_unregister(struct attribute_container *cont);
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void attribute_container_create_device(struct device *dev,
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int (*fn)(struct attribute_container *,
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struct device *,
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struct class_device *));
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void attribute_container_add_device(struct device *dev,
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int (*fn)(struct attribute_container *,
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struct device *,
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struct class_device *));
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void attribute_container_remove_device(struct device *dev,
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void (*fn)(struct attribute_container *,
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struct device *,
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struct class_device *));
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void attribute_container_device_trigger(struct device *dev,
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int (*fn)(struct attribute_container *,
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struct device *,
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struct class_device *));
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void attribute_container_trigger(struct device *dev,
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int (*fn)(struct attribute_container *,
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struct device *));
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int attribute_container_add_attrs(struct class_device *classdev);
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int attribute_container_add_class_device(struct class_device *classdev);
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int attribute_container_add_class_device_adapter(struct attribute_container *cont,
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struct device *dev,
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struct class_device *classdev);
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void attribute_container_remove_attrs(struct class_device *classdev);
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void attribute_container_class_device_del(struct class_device *classdev);
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struct attribute_container *attribute_container_classdev_to_container(struct class_device *);
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struct class_device *attribute_container_find_class_device(struct attribute_container *, struct device *);
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struct class_device_attribute **attribute_container_classdev_to_attrs(const struct class_device *classdev);
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#endif
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