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7c1ef33870
attribute_container_device_trigger invokes callbacks that may fail for one or more classdevs, for instance, the transport_add_class_device callback, called during transport creation, does memory allocation. This information, though, is not propagated to upper layers, and any driver using the attribute_container_device_trigger API will not know whether any, some, or all callbacks succeeded. This patch implements a safe version of this dispatcher, to either succeed all the callbacks or revert to the original state. Link: https://lore.kernel.org/r/20200106185817.640331-2-krisman@collabora.com Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* attribute_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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#ifndef _ATTRIBUTE_CONTAINER_H_
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#define _ATTRIBUTE_CONTAINER_H_
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#include <linux/list.h>
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#include <linux/klist.h>
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struct device;
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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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const struct attribute_group *grp;
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struct 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 __must_check 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 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 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 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 device *));
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int attribute_container_device_trigger_safe(struct device *dev,
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int (*fn)(struct attribute_container *,
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struct device *,
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struct device *),
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int (*undo)(struct attribute_container *,
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struct device *,
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struct 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 device *classdev);
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int attribute_container_add_class_device(struct 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 device *classdev);
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void attribute_container_remove_attrs(struct device *classdev);
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void attribute_container_class_device_del(struct device *classdev);
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struct attribute_container *attribute_container_classdev_to_container(struct device *);
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struct device *attribute_container_find_class_device(struct attribute_container *, struct device *);
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struct device_attribute **attribute_container_classdev_to_attrs(const struct device *classdev);
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#endif
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