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authorOliver Neukum <oliver@neukum.org>2006-12-20 10:52:44 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2007-02-07 10:37:13 -0800
commit94bebf4d1b8e7719f0f3944c037a21cfd99a4af7 (patch)
tree25c6ba1836e74f608b4e434b4f0f4d5c28b11de1 /fs/sysfs/dir.c
parentcb986b749c7178422bfbc982cd30e04d5db54bbc (diff)
downloadop-kernel-dev-94bebf4d1b8e7719f0f3944c037a21cfd99a4af7.zip
op-kernel-dev-94bebf4d1b8e7719f0f3944c037a21cfd99a4af7.tar.gz
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>
Diffstat (limited to 'fs/sysfs/dir.c')
-rw-r--r--fs/sysfs/dir.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 2bab1b4..9ff0449 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/namei.h>
+#include <asm/semaphore.h>
#include "sysfs.h"
DECLARE_RWSEM(sysfs_rename_sem);
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