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| author | Frederik Deweerdt <deweerdt@free.fr> | 2007-01-05 23:04:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-02-07 21:37:13 +0300 |
| commit | d3fc373ac5061cab7a654502b942e7d00e77f733 (patch) | |
| tree | b93390a9b48f3e9438cab9f2f1f1ee6f1907bb69 | |
| parent | 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7 (diff) | |
| download | linux-d3fc373ac5061cab7a654502b942e7d00e77f733.tar.xz | |
sysfs: suppress lockdep warnings
Lockdep issues the following warning:
[ 9.064000] =============================================
[ 9.064000] [ INFO: possible recursive locking detected ]
[ 9.064000] 2.6.20-rc3-mm1 #3
[ 9.064000] ---------------------------------------------
[ 9.064000] init/1 is trying to acquire lock:
[ 9.064000] (&sysfs_inode_imutex_key){--..}, at: [<c03e6afc>] mutex_lock+0x1c/0x1f
[ 9.064000]
[ 9.064000] but task is already holding lock:
[ 9.064000] (&sysfs_inode_imutex_key){--..}, at: [<c03e6afc>] mutex_lock+0x1c/0x1f
[ 9.065000]
[ 9.065000] other info that might help us debug this:
[ 9.065000] 2 locks held by init/1:
[ 9.065000] #0: (tty_mutex){--..}, at: [<c03e6afc>] mutex_lock+0x1c/0x1f
[ 9.065000] #1: (&sysfs_inode_imutex_key){--..}, at: [<c03e6afc>] mutex_lock+0x1c/0x1f
[ 9.065000]
[ 9.065000] stack backtrace:
[ 9.065000] [<c010390d>] show_trace_log_lvl+0x1a/0x30
[ 9.066000] [<c0103935>] show_trace+0x12/0x14
[ 9.066000] [<c0103a2f>] dump_stack+0x16/0x18
[ 9.066000] [<c0138cb8>] print_deadlock_bug+0xb9/0xc3
[ 9.066000] [<c0138d17>] check_deadlock+0x55/0x5a
[ 9.066000] [<c013a953>] __lock_acquire+0x371/0xbf0
[ 9.066000] [<c013b7a9>] lock_acquire+0x69/0x83
[ 9.066000] [<c03e6b7e>] __mutex_lock_slowpath+0x75/0x2d1
[ 9.066000] [<c03e6afc>] mutex_lock+0x1c/0x1f
[ 9.066000] [<c01b249c>] sysfs_drop_dentry+0xb1/0x133
[ 9.066000] [<c01b25d1>] sysfs_hash_and_remove+0xb3/0x142
[ 9.066000] [<c01b30ed>] sysfs_remove_file+0xd/0x10
[ 9.067000] [<c02849e0>] device_remove_file+0x23/0x2e
[ 9.067000] [<c02850b2>] device_del+0x188/0x1e6
[ 9.067000] [<c028511b>] device_unregister+0xb/0x15
[ 9.067000] [<c0285318>] device_destroy+0x9c/0xa9
[ 9.067000] [<c0261431>] vcs_remove_sysfs+0x1c/0x3b
[ 9.067000] [<c0267a08>] con_close+0x5e/0x6b
[ 9.067000] [<c02598f2>] release_dev+0x4c4/0x6e5
[ 9.067000] [<c0259faa>] tty_release+0x12/0x1c
[ 9.067000] [<c0174872>] __fput+0x177/0x1a0
[ 9.067000] [<c01746f5>] fput+0x3b/0x41
[ 9.068000] [<c0172ee1>] filp_close+0x36/0x65
[ 9.068000] [<c0172f73>] sys_close+0x63/0xa4
[ 9.068000] [<c0102a96>] sysenter_past_esp+0x5f/0x99
[ 9.068000] =======================
This is due to sysfs_hash_and_remove() holding dir->d_inode->i_mutex
before calling sysfs_drop_dentry() which calls orphan_all_buffers()
which in turn takes node->i_mutex.
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/sysfs/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index 1a81ebce20e9..dbd820f9aeed 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -215,7 +215,7 @@ static inline void orphan_all_buffers(struct inode *node) struct sysfs_buffer_collection *set = node->i_private; struct sysfs_buffer *buf; - mutex_lock(&node->i_mutex); + mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD); if (node->i_private) { list_for_each_entry(buf, &set->associates, associates) { down(&buf->sem); @@ -272,7 +272,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name) return -ENOENT; parent_sd = dir->d_fsdata; - mutex_lock(&dir->d_inode->i_mutex); + mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (!sd->s_element) continue; |