Mark Lord wrote:
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*
Further info: Reverting this change (below) fixes it:
| author Marcel Holtmann <[EMAIL PROTECTED]>
| Sat, 17 Feb 2007 22:58:57 +0000 (23:58 +0100)
| committer David S. Miller <[EMAIL PROTECTED]>
| 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 <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
---
--- 2.6.21/fs/sysfs/dir.c 2007-03-04 13:19:00.000000000 -0500
+++ linux/fs/sysfs/dir.c 2007-03-04 13:20:45.000000000 -0500
@@ -431,6 +431,8 @@
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)) {
-
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