From 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oliver@neukum.org>
Date: Wed, 20 Dec 2006 10:52:44 +0100
Subject: Driver core: fix race in sysfs between sysfs_remove_file() and
 read()/write()

This patch prevents a race between IO and removing a file from sysfs.
It introduces a list of sysfs_buffers associated with a file at the inode.
Upon removal of a file the list is walked and the buffers marked orphaned.
IO to orphaned buffers fails with -ENODEV. The driver can safely free
associated data structures or be unloaded.

Signed-off-by: Oliver Neukum <oliver@neukum.name>
Acked-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 fs/sysfs/symlink.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'fs/sysfs/symlink.c')

diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index f50e3cc2ded..4869f611192 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -7,6 +7,7 @@
 #include <linux/module.h>
 #include <linux/kobject.h>
 #include <linux/namei.h>
+#include <asm/semaphore.h>
 
 #include "sysfs.h"
 
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