fc7e482899
sysfs: fix drivers/pci so if an attribute does not implement
show or store method read/write will return -EIO
instead of 0.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
/*
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* Interface for Dynamic Logical Partitioning of I/O Slots on
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* RPA-compliant PPC64 platform.
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*
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* John Rose <johnrose@austin.ibm.com>
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* October 2003
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*
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* Copyright (C) 2003 IBM.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include "pci_hotplug.h"
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#include "rpadlpar.h"
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#define DLPAR_KOBJ_NAME "control"
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#define ADD_SLOT_ATTR_NAME "add_slot"
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#define REMOVE_SLOT_ATTR_NAME "remove_slot"
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#define MAX_DRC_NAME_LEN 64
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/* Store return code of dlpar operation in attribute struct */
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struct dlpar_io_attr {
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int rc;
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struct attribute attr;
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ssize_t (*store)(struct dlpar_io_attr *dlpar_attr, const char *buf,
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size_t nbytes);
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};
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/* Common show callback for all attrs, display the return code
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* of the dlpar op */
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static ssize_t
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dlpar_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
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{
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struct dlpar_io_attr *dlpar_attr = container_of(attr,
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struct dlpar_io_attr, attr);
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return sprintf(buf, "%d\n", dlpar_attr->rc);
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}
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static ssize_t
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dlpar_attr_store(struct kobject * kobj, struct attribute * attr,
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const char *buf, size_t nbytes)
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{
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struct dlpar_io_attr *dlpar_attr = container_of(attr,
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struct dlpar_io_attr, attr);
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return dlpar_attr->store ?
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dlpar_attr->store(dlpar_attr, buf, nbytes) : -EIO;
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}
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static struct sysfs_ops dlpar_attr_sysfs_ops = {
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.show = dlpar_attr_show,
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.store = dlpar_attr_store,
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};
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static ssize_t add_slot_store(struct dlpar_io_attr *dlpar_attr,
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const char *buf, size_t nbytes)
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{
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char drc_name[MAX_DRC_NAME_LEN];
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char *end;
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if (nbytes > MAX_DRC_NAME_LEN)
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return 0;
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memcpy(drc_name, buf, nbytes);
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end = strchr(drc_name, '\n');
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if (!end)
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end = &drc_name[nbytes];
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*end = '\0';
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dlpar_attr->rc = dlpar_add_slot(drc_name);
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return nbytes;
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}
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static ssize_t remove_slot_store(struct dlpar_io_attr *dlpar_attr,
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const char *buf, size_t nbytes)
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{
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char drc_name[MAX_DRC_NAME_LEN];
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char *end;
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if (nbytes > MAX_DRC_NAME_LEN)
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return 0;
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memcpy(drc_name, buf, nbytes);
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end = strchr(drc_name, '\n');
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if (!end)
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end = &drc_name[nbytes];
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*end = '\0';
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dlpar_attr->rc = dlpar_remove_slot(drc_name);
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return nbytes;
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}
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static struct dlpar_io_attr add_slot_attr = {
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.rc = 0,
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.attr = { .name = ADD_SLOT_ATTR_NAME, .mode = 0644, },
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.store = add_slot_store,
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};
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static struct dlpar_io_attr remove_slot_attr = {
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.rc = 0,
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.attr = { .name = REMOVE_SLOT_ATTR_NAME, .mode = 0644},
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.store = remove_slot_store,
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};
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static struct attribute *default_attrs[] = {
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&add_slot_attr.attr,
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&remove_slot_attr.attr,
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NULL,
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};
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static void dlpar_io_release(struct kobject *kobj)
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{
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/* noop */
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return;
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}
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struct kobj_type ktype_dlpar_io = {
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.release = dlpar_io_release,
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.sysfs_ops = &dlpar_attr_sysfs_ops,
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.default_attrs = default_attrs,
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};
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struct kset dlpar_io_kset = {
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.subsys = &pci_hotplug_slots_subsys,
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.kobj = {.name = DLPAR_KOBJ_NAME, .ktype=&ktype_dlpar_io,},
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.ktype = &ktype_dlpar_io,
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};
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int dlpar_sysfs_init(void)
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{
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if (kset_register(&dlpar_io_kset)) {
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printk(KERN_ERR "rpadlpar_io: cannot register kset for %s\n",
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dlpar_io_kset.kobj.name);
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return -EINVAL;
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}
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return 0;
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}
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void dlpar_sysfs_exit(void)
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{
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kset_unregister(&dlpar_io_kset);
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}
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