mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 15:31:14 +07:00
99b7623380
Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy as correctly noted at bug #12454. Someone can lookup entry with NULL ->owner, thus not pinning enything, and release it later resulting in module refcount underflow. We can keep ->owner and supply it at registration time like ->proc_fops and ->data. But this leaves ->owner as easy-manipulative field (just one C assignment) and somebody will forget to unpin previous/pin current module when switching ->owner. ->proc_fops is declared as "const" which should give some thoughts. ->read_proc/->write_proc were just fixed to not require ->owner for protection. rmmod'ed directories will be empty and return "." and ".." -- no harm. And directories with tricky enough readdir and lookup shouldn't be modular. We definitely don't want such modular code. Removing ->owner will also make PDE smaller. So, let's nuke it. Kudos to Jeff Layton for reminding about this, let's say, oversight. http://bugzilla.kernel.org/show_bug.cgi?id=12454 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/*********************************************************************
|
|
*
|
|
* Filename: irproc.c
|
|
* Version: 1.0
|
|
* Description: Various entries in the /proc file system
|
|
* Status: Experimental.
|
|
* Author: Thomas Davis, <ratbert@radiks.net>
|
|
* Created at: Sat Feb 21 21:33:24 1998
|
|
* Modified at: Sun Nov 14 08:54:54 1999
|
|
* Modified by: Dag Brattli <dagb@cs.uit.no>
|
|
*
|
|
* Copyright (c) 1998-1999, Dag Brattli <dagb@cs.uit.no>
|
|
* Copyright (c) 1998, Thomas Davis, <ratbert@radiks.net>,
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* I, Thomas Davis, provide no warranty for any of this software.
|
|
* This material is provided "AS-IS" and at no charge.
|
|
*
|
|
********************************************************************/
|
|
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <net/net_namespace.h>
|
|
|
|
#include <net/irda/irda.h>
|
|
#include <net/irda/irlap.h>
|
|
#include <net/irda/irlmp.h>
|
|
|
|
extern struct file_operations discovery_seq_fops;
|
|
extern struct file_operations irlap_seq_fops;
|
|
extern struct file_operations irlmp_seq_fops;
|
|
extern struct file_operations irttp_seq_fops;
|
|
extern struct file_operations irias_seq_fops;
|
|
|
|
struct irda_entry {
|
|
const char *name;
|
|
struct file_operations *fops;
|
|
};
|
|
|
|
struct proc_dir_entry *proc_irda;
|
|
EXPORT_SYMBOL(proc_irda);
|
|
|
|
static struct irda_entry irda_dirs[] = {
|
|
{"discovery", &discovery_seq_fops},
|
|
{"irttp", &irttp_seq_fops},
|
|
{"irlmp", &irlmp_seq_fops},
|
|
{"irlap", &irlap_seq_fops},
|
|
{"irias", &irias_seq_fops},
|
|
};
|
|
|
|
/*
|
|
* Function irda_proc_register (void)
|
|
*
|
|
* Register irda entry in /proc file system
|
|
*
|
|
*/
|
|
void __init irda_proc_register(void)
|
|
{
|
|
int i;
|
|
struct proc_dir_entry *d;
|
|
|
|
proc_irda = proc_mkdir("irda", init_net.proc_net);
|
|
if (proc_irda == NULL)
|
|
return;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(irda_dirs); i++)
|
|
d = proc_create(irda_dirs[i].name, 0, proc_irda,
|
|
irda_dirs[i].fops);
|
|
}
|
|
|
|
/*
|
|
* Function irda_proc_unregister (void)
|
|
*
|
|
* Unregister irda entry in /proc file system
|
|
*
|
|
*/
|
|
void irda_proc_unregister(void)
|
|
{
|
|
int i;
|
|
|
|
if (proc_irda) {
|
|
for (i=0; i<ARRAY_SIZE(irda_dirs); i++)
|
|
remove_proc_entry(irda_dirs[i].name, proc_irda);
|
|
|
|
remove_proc_entry("irda", init_net.proc_net);
|
|
proc_irda = NULL;
|
|
}
|
|
}
|
|
|
|
|