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613655fa39
All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. These drivers do not seem to be under active maintainance from my brief investigation. Apologies to those maintainers that I have missed. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de>
242 lines
5.7 KiB
C
242 lines
5.7 KiB
C
/*
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* Compaq Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <greg@kroah.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/workqueue.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/mutex.h>
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#include <linux/debugfs.h>
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#include "cpqphp.h"
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static DEFINE_MUTEX(cpqphp_mutex);
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static int show_ctrl (struct controller *ctrl, char *buf)
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{
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char *out = buf;
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int index;
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struct pci_resource *res;
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out += sprintf(buf, "Free resources: memory\n");
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index = 11;
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res = ctrl->mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "Free resources: prefetchable memory\n");
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index = 11;
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res = ctrl->p_mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "Free resources: IO\n");
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index = 11;
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res = ctrl->io_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "Free resources: bus numbers\n");
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index = 11;
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res = ctrl->bus_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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return out - buf;
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}
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static int show_dev (struct controller *ctrl, char *buf)
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{
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char * out = buf;
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int index;
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struct pci_resource *res;
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struct pci_func *new_slot;
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struct slot *slot;
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slot = ctrl->slot;
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while (slot) {
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new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
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if (!new_slot)
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break;
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out += sprintf(out, "assigned resources: memory\n");
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index = 11;
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res = new_slot->mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "assigned resources: prefetchable memory\n");
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index = 11;
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res = new_slot->p_mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "assigned resources: IO\n");
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index = 11;
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res = new_slot->io_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "assigned resources: bus numbers\n");
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index = 11;
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res = new_slot->bus_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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slot=slot->next;
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}
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return out - buf;
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}
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static int spew_debug_info(struct controller *ctrl, char *data, int size)
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{
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int used;
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used = size - show_ctrl(ctrl, data);
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used = (size - used) - show_dev(ctrl, &data[used]);
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return used;
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}
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struct ctrl_dbg {
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int size;
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char *data;
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struct controller *ctrl;
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};
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#define MAX_OUTPUT (4*PAGE_SIZE)
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static int open(struct inode *inode, struct file *file)
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{
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struct controller *ctrl = inode->i_private;
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struct ctrl_dbg *dbg;
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int retval = -ENOMEM;
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mutex_lock(&cpqphp_mutex);
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dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
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if (!dbg)
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goto exit;
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dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
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if (!dbg->data) {
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kfree(dbg);
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goto exit;
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}
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dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
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file->private_data = dbg;
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retval = 0;
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exit:
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mutex_unlock(&cpqphp_mutex);
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return retval;
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}
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static loff_t lseek(struct file *file, loff_t off, int whence)
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{
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struct ctrl_dbg *dbg;
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loff_t new = -1;
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mutex_lock(&cpqphp_mutex);
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dbg = file->private_data;
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switch (whence) {
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case 0:
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new = off;
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break;
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case 1:
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new = file->f_pos + off;
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break;
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}
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if (new < 0 || new > dbg->size) {
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mutex_unlock(&cpqphp_mutex);
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return -EINVAL;
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}
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mutex_unlock(&cpqphp_mutex);
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return (file->f_pos = new);
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}
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static ssize_t read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct ctrl_dbg *dbg = file->private_data;
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return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
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}
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static int release(struct inode *inode, struct file *file)
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{
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struct ctrl_dbg *dbg = file->private_data;
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kfree(dbg->data);
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kfree(dbg);
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return 0;
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}
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static const struct file_operations debug_ops = {
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.owner = THIS_MODULE,
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.open = open,
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.llseek = lseek,
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.read = read,
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.release = release,
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};
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static struct dentry *root;
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void cpqhp_initialize_debugfs(void)
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{
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if (!root)
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root = debugfs_create_dir("cpqhp", NULL);
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}
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void cpqhp_shutdown_debugfs(void)
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{
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debugfs_remove(root);
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}
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void cpqhp_create_debugfs_files(struct controller *ctrl)
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{
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ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
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S_IRUGO, root, ctrl, &debug_ops);
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}
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void cpqhp_remove_debugfs_files(struct controller *ctrl)
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{
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if (ctrl->dentry)
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debugfs_remove(ctrl->dentry);
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ctrl->dentry = NULL;
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}
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