Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=116ba5d5ea1a5789a8c14b1087014007cada363b
Commit: 116ba5d5ea1a5789a8c14b1087014007cada363b
Parent: ba611edfe406be745be95c332990c8e908c026c3
Author: Joonwoo Park <[EMAIL PROTECTED]>
AuthorDate: Wed Dec 26 12:09:57 2007 +0900
Committer: Mark Fasheh <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 15:05:47 2008 -0800
configfs: file.c fix possible recursive locking
configfs_register_subsystem() with default_groups triggers recursive
locking.
it seems that mutex_lock_nested is needed.
=============================================
[ INFO: possible recursive locking detected ]
2.6.24-rc6 #145
---------------------------------------------
swapper/1 is trying to acquire lock:
(&sb->s_type->i_mutex_key#3){--..}, at: [<c40c9a9e>]
configfs_add_file+0x2e/0x70
but task is already holding lock:
(&sb->s_type->i_mutex_key#3){--..}, at: [<c40ca985>]
configfs_register_subsystem+0x55/0x130
other info that might help us debug this:
1 lock held by swapper/1:
#0: (&sb->s_type->i_mutex_key#3){--..}, at: [<c40ca985>]
configfs_register_subsystem+0x55/0x130
stack backtrace:
Pid: 1, comm: swapper Not tainted 2.6.24-rc6 #145
[<c40053ba>] show_trace_log_lvl+0x1a/0x30
[<c4005e82>] show_trace+0x12/0x20
[<c400687e>] dump_stack+0x6e/0x80
[<c404ec72>] __lock_acquire+0xe62/0x1120
[<c404efb2>] lock_acquire+0x82/0xa0
[<c43fda88>] mutex_lock_nested+0x98/0x2e0
[<c40c9a9e>] configfs_add_file+0x2e/0x70
[<c40c9b0c>] configfs_create_file+0x2c/0x40
[<c40ca639>] configfs_attach_item+0x139/0x220
[<c40ca734>] configfs_attach_group+0x14/0x140
[<c40ca7e9>] configfs_attach_group+0xc9/0x140
[<c40ca9f6>] configfs_register_subsystem+0xc6/0x130
[<c45c8186>] init_netconsole+0x2b6/0x300
[<c45a75f2>] kernel_init+0x142/0x320
[<c4004fb3>] kernel_thread_helper+0x7/0x14
=======================
Signed-off-by: Joonwoo Park <[EMAIL PROTECTED]>
Signed-off-by: Joel Becker <[EMAIL PROTECTED]>
Signed-off-by: Mark Fasheh <[EMAIL PROTECTED]>
---
fs/configfs/file.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index a3658f9..397cb50 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -320,7 +320,7 @@ int configfs_add_file(struct dentry * dir, const struct
configfs_attribute * att
umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG;
int error = 0;
- mutex_lock(&dir->d_inode->i_mutex);
+ mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_NORMAL);
error = configfs_make_dirent(parent_sd, NULL, (void *) attr, mode,
type);
mutex_unlock(&dir->d_inode->i_mutex);
-
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