https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 83a7eefedc9b56fe7bfeff13b6c7356688ffa670 authored by Linus Torvalds on 09 June 2024, 21:19:43 UTC
Linux 6.10-rc3
Linux 6.10-rc3
Tip revision: 83a7eef
proc.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ISA Plug & Play support
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#include <linux/module.h>
#include <linux/isapnp.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/uaccess.h>
extern struct pnp_protocol isapnp_protocol;
static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
{
return fixed_size_llseek(file, off, whence, 256);
}
static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
size_t nbytes, loff_t * ppos)
{
struct pnp_dev *dev = pde_data(file_inode(file));
int pos = *ppos;
int cnt, size = 256;
if (pos >= size)
return 0;
if (nbytes >= size)
nbytes = size;
if (pos + nbytes > size)
nbytes = size - pos;
cnt = nbytes;
if (!access_ok(buf, cnt))
return -EINVAL;
isapnp_cfg_begin(dev->card->number, dev->number);
for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
unsigned char val;
val = isapnp_read_byte(pos);
__put_user(val, buf);
}
isapnp_cfg_end();
*ppos = pos;
return nbytes;
}
static const struct proc_ops isapnp_proc_bus_proc_ops = {
.proc_lseek = isapnp_proc_bus_lseek,
.proc_read = isapnp_proc_bus_read,
};
static int isapnp_proc_attach_device(struct pnp_dev *dev)
{
struct pnp_card *bus = dev->card;
char name[16];
if (!bus->procdir) {
sprintf(name, "%02x", bus->number);
bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
if (!bus->procdir)
return -ENOMEM;
}
sprintf(name, "%02x", dev->number);
dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, bus->procdir,
&isapnp_proc_bus_proc_ops, dev);
if (!dev->procent)
return -ENOMEM;
proc_set_size(dev->procent, 256);
return 0;
}
int __init isapnp_proc_init(void)
{
struct pnp_dev *dev;
isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
protocol_for_each_dev(&isapnp_protocol, dev) {
isapnp_proc_attach_device(dev);
}
return 0;
}