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| author | Oliver Neukum <oliver@neukum.org> | 2006-12-20 10:52:44 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-02-07 10:37:13 -0800 |
| commit | 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7 (patch) | |
| tree | 25c6ba1836e74f608b4e434b4f0f4d5c28b11de1 /fs/sysfs/symlink.c | |
| parent | cb986b749c7178422bfbc982cd30e04d5db54bbc (diff) | |
| download | lwn-94bebf4d1b8e7719f0f3944c037a21cfd99a4af7.tar.gz lwn-94bebf4d1b8e7719f0f3944c037a21cfd99a4af7.zip | |
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/symlink.c')
| -rw-r--r-- | fs/sysfs/symlink.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c index f50e3cc2ded8..4869f611192f 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" |