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969affd276
It's possible that the caller of sysfs_remove_group messed up and passed in an attribute group that was not really registered to this kobject. But don't panic for such a foolish error, spit out a warning about what happened, and continue on our way safely. Cc: Roland Dreier <rdreier@cisco.com> Cc: Tejun Heo <htejun@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
/*
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* fs/sysfs/group.c - Operations for adding/removing multiple files at once.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released undert the GPL v2.
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*
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*/
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/err.h>
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#include "sysfs.h"
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static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
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const struct attribute_group *grp)
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{
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struct attribute *const* attr;
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int i;
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for (i = 0, attr = grp->attrs; *attr; i++, attr++)
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if (!grp->is_visible ||
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grp->is_visible(kobj, *attr, i))
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sysfs_hash_and_remove(dir_sd, (*attr)->name);
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}
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static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
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const struct attribute_group *grp)
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{
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struct attribute *const* attr;
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int error = 0, i;
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for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
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if (!grp->is_visible ||
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grp->is_visible(kobj, *attr, i))
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error |=
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sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
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if (error)
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remove_files(dir_sd, kobj, grp);
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return error;
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}
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int sysfs_create_group(struct kobject * kobj,
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const struct attribute_group * grp)
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{
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struct sysfs_dirent *sd;
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int error;
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BUG_ON(!kobj || !kobj->sd);
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if (grp->name) {
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error = sysfs_create_subdir(kobj, grp->name, &sd);
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if (error)
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return error;
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} else
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sd = kobj->sd;
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sysfs_get(sd);
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error = create_files(sd, kobj, grp);
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if (error) {
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if (grp->name)
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sysfs_remove_subdir(sd);
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}
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sysfs_put(sd);
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return error;
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}
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void sysfs_remove_group(struct kobject * kobj,
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const struct attribute_group * grp)
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{
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struct sysfs_dirent *dir_sd = kobj->sd;
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struct sysfs_dirent *sd;
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if (grp->name) {
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sd = sysfs_get_dirent(dir_sd, grp->name);
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if (!sd) {
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printk(KERN_WARNING "sysfs group %p not found for "
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"kobject '%s'\n", grp, kobject_name(kobj));
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WARN_ON(!sd);
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return;
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}
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} else
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sd = sysfs_get(dir_sd);
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remove_files(sd, kobj, grp);
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if (grp->name)
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sysfs_remove_subdir(sd);
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sysfs_put(sd);
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}
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EXPORT_SYMBOL_GPL(sysfs_create_group);
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EXPORT_SYMBOL_GPL(sysfs_remove_group);
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