diff options
| author | Jiri Kosina <jkosina@suse.cz> | 2013-04-22 15:40:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-25 21:23:48 -0700 |
| commit | bb5489176fda28aff304b59e0405f7d7d4906224 (patch) | |
| tree | 26ccc319459a55b26e05a9ec4d345bf2540569a6 | |
| parent | 0236d37edc0522f37b83eba35432815cd98789ff (diff) | |
Revert "sysfs: fix race between readdir and lseek"
This reverts commit 991f76f837bf22c5bb07261cfd86525a0a96650c in Linus'
tree which is f366c8f271888f48e15cc7c0ab70f184c220c8a4 in
linux-stable.git
It depends on ef3d0fd27e90f ("vfs: do (nearly) lockless generic_file_llseek")
which is available only in 3.2+.
When applied on 3.0 codebase, it causes A-A deadlock, whenever anyone does
seek() on sysfs, as both generic_file_llseek() and sysfs_dir_llseek() obtain
i_mutex.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/sysfs/dir.c | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 7cbc5856feea..3ab78b873376 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -959,21 +959,9 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) return 0; } -static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence) -{ - struct inode *inode = file->f_path.dentry->d_inode; - loff_t ret; - - mutex_lock(&inode->i_mutex); - ret = generic_file_llseek(file, offset, whence); - mutex_unlock(&inode->i_mutex); - - return ret; -} - const struct file_operations sysfs_dir_operations = { .read = generic_read_dir, .readdir = sysfs_readdir, .release = sysfs_dir_release, - .llseek = sysfs_dir_llseek, + .llseek = generic_file_llseek, }; |