The patch titled
sysfs: suppress lockdep warnings
has been removed from the -mm tree. Its filename was
fix2-gregkh-driver-driver-core-fix-race-in-sysfs-between-sysfs_remove_file-and-read-write.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sysfs: suppress lockdep warnings
From: Frederik Deweerdt <deweerdt@xxxxxxx>
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@xxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Oliver Neukum <oliver@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/sysfs/inode.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff -puN fs/sysfs/inode.c~fix2-gregkh-driver-driver-core-fix-race-in-sysfs-between-sysfs_remove_file-and-read-write fs/sysfs/inode.c
--- a/fs/sysfs/inode.c~fix2-gregkh-driver-driver-core-fix-race-in-sysfs-between-sysfs_remove_file-and-read-write
+++ a/fs/sysfs/inode.c
@@ -214,7 +214,7 @@ static inline void orphan_all_buffers(st
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);
@@ -271,7 +271,7 @@ int sysfs_hash_and_remove(struct dentry
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;
_
Patches currently in -mm which might be from deweerdt@xxxxxxx are
git-acpi-early-acpi-lockup.patch
remove-tcp-header-from-tcp_v4_check-take-2.patch
disable-init-initramfsc-updated-fix.patch
user-ns-prepare-copy_tree-copy_mnt-and-their-callers-to-handle-errs-fix.patch
user-ns-implement-user-ns-unshare.patch
reiser4-sb_sync_inodes-fix.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
