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authorMark Lord <lkml@rtr.ca>2007-03-06 01:42:03 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-06 09:30:24 -0800
commit0de1517e23c2e28d58a6344b97a120596ea200bb (patch)
tree13760d58a2b12f5849be7bb478167ecb99028f5c /fs/sysfs
parent166f60dde0f3793e67bd0d76952eaa46705bbaa9 (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')
-rw-r--r--fs/sysfs/dir.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 8813990304f..85a668680f8 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)) {