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40501c70e3
snprintf() may not always return the correct size of used bytes but instead the length the resulting string would be if it would fit into the buffer. So scnprintf() is the function to use when the real length of the resulting string is needed. Replace all occurrences of snprintf() with scnprintf() where the return code is further processed. Also find and fix some occurrences where sprintf() was used. Suggested-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
188 lines
4.3 KiB
C
188 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright IBM Corp. 2001, 2012
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* Author(s): Robert Burroughs
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* Eric Rossman (edrossma@us.ibm.com)
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
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* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/compat.h>
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#include <linux/slab.h>
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#include <linux/atomic.h>
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#include <linux/uaccess.h>
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#include <linux/hw_random.h>
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#include <linux/debugfs.h>
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#include <asm/debug.h>
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#include "zcrypt_debug.h"
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#include "zcrypt_api.h"
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#include "zcrypt_msgtype6.h"
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#include "zcrypt_msgtype50.h"
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/*
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* Device attributes common for all crypto card devices.
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*/
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static ssize_t type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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return scnprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
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}
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static DEVICE_ATTR_RO(type);
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static ssize_t online_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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return scnprintf(buf, PAGE_SIZE, "%d\n", zc->online);
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}
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static ssize_t online_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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struct zcrypt_queue *zq;
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int online, id;
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if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
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return -EINVAL;
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zc->online = online;
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id = zc->card->id;
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ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
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spin_lock(&zcrypt_list_lock);
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list_for_each_entry(zq, &zc->zqueues, list)
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zcrypt_queue_force_online(zq, online);
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spin_unlock(&zcrypt_list_lock);
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return count;
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}
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static DEVICE_ATTR_RW(online);
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static ssize_t load_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load));
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}
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static DEVICE_ATTR_RO(load);
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static struct attribute *zcrypt_card_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_online.attr,
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&dev_attr_load.attr,
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NULL,
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};
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static const struct attribute_group zcrypt_card_attr_group = {
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.attrs = zcrypt_card_attrs,
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};
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struct zcrypt_card *zcrypt_card_alloc(void)
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{
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struct zcrypt_card *zc;
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zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
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if (!zc)
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return NULL;
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INIT_LIST_HEAD(&zc->list);
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INIT_LIST_HEAD(&zc->zqueues);
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kref_init(&zc->refcount);
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return zc;
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}
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EXPORT_SYMBOL(zcrypt_card_alloc);
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void zcrypt_card_free(struct zcrypt_card *zc)
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{
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kfree(zc);
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}
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EXPORT_SYMBOL(zcrypt_card_free);
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static void zcrypt_card_release(struct kref *kref)
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{
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struct zcrypt_card *zdev =
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container_of(kref, struct zcrypt_card, refcount);
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zcrypt_card_free(zdev);
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}
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void zcrypt_card_get(struct zcrypt_card *zc)
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{
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kref_get(&zc->refcount);
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}
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EXPORT_SYMBOL(zcrypt_card_get);
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int zcrypt_card_put(struct zcrypt_card *zc)
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{
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return kref_put(&zc->refcount, zcrypt_card_release);
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}
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EXPORT_SYMBOL(zcrypt_card_put);
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/**
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* zcrypt_card_register() - Register a crypto card device.
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* @zc: Pointer to a crypto card device
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*
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* Register a crypto card device. Returns 0 if successful.
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*/
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int zcrypt_card_register(struct zcrypt_card *zc)
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{
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int rc;
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rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
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&zcrypt_card_attr_group);
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if (rc)
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return rc;
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spin_lock(&zcrypt_list_lock);
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list_add_tail(&zc->list, &zcrypt_card_list);
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spin_unlock(&zcrypt_list_lock);
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zc->online = 1;
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ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
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return rc;
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}
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EXPORT_SYMBOL(zcrypt_card_register);
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/**
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* zcrypt_card_unregister(): Unregister a crypto card device.
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* @zc: Pointer to crypto card device
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*
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* Unregister a crypto card device.
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*/
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void zcrypt_card_unregister(struct zcrypt_card *zc)
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{
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ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
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spin_lock(&zcrypt_list_lock);
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list_del_init(&zc->list);
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spin_unlock(&zcrypt_list_lock);
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sysfs_remove_group(&zc->card->ap_dev.device.kobj,
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&zcrypt_card_attr_group);
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}
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EXPORT_SYMBOL(zcrypt_card_unregister);
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