diff options
| author | Mark Lord <lkml@rtr.ca> | 2007-03-06 01:42:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-06 09:30:24 -0800 |
| commit | 0de1517e23c2e28d58a6344b97a120596ea200bb (patch) | |
| tree | 13760d58a2b12f5849be7bb478167ecb99028f5c /fs/sysfs/dir.c | |
| parent | 166f60dde0f3793e67bd0d76952eaa46705bbaa9 (diff) | |
[PATCH] Fix 2.6.21 rfcomm lockups
Any attempt to open/use a bluetooth rfcomm device locks up
scheduling completely on my machine.
Interrupts (ping, alt-sysrq) seem to be alive, but nothing else.
This was working fine in 2.6.20, broken now in 2.6.21-rc2-git*
Reverting this change (below) fixes it:
| author Marcel Holtmann <marcel@holtmann.org>
| Sat, 17 Feb 2007 22:58:57 +0000 (23:58 +0100)
| committer David S. Miller <davem@sunset.davemloft.net>
| Mon, 26 Feb 2007 19:42:41 +0000 (11:42 -0800)
| commit c1a3313698895d8ad4760f98642007bf236af2e8
| tree 337a876f727061362b6a169f8759849c105b8f7a tree | snapshot
| parent f5ffd4620aba9e55656483ae1ef5c79ba81f5403 commit | diff
| | [Bluetooth] Make use of device_move() for RFCOMM TTY devices
| | In the case of bound RFCOMM TTY devices the parent is not available
| before its usage. So when opening a RFCOMM TTY device, move it to
| the corresponding ACL device as a child. When closing the device,
| move it back to the virtual device tree.
| Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
The simplest fix for this bug is to prevent sysfs_move_dir()
from self-deadlocking when (old_parent == new_parent).
This patch prevents total system lockup when using rfcomm devices.
Signed-off-by: Mark Lord <mlord@pobox.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/sysfs/dir.c')
| -rw-r--r-- | fs/sysfs/dir.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 8813990304fe..85a668680f82 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -431,6 +431,8 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent) new_parent_dentry = new_parent ? new_parent->dentry : sysfs_mount->mnt_sb->s_root; + if (old_parent_dentry->d_inode == new_parent_dentry->d_inode) + return 0; /* nothing to move */ again: mutex_lock(&old_parent_dentry->d_inode->i_mutex); if (!mutex_trylock(&new_parent_dentry->d_inode->i_mutex)) { |