[bluetooth] linux-3.x regression (bisected)

[Rene Herman <rene.herman@gmail.com>]

Good day.

A while ago, my noname USB Bluetooth adapter stopped working, with from 
that point on only "Bluetooth: hci0 command tx timeout" appearing in the 
kernel messages.

I just now got around to looking at it and bisected this to commit 
eead27da60df80a112d1ac3ea482226e9794c26b:

===
Author: Andre Guedes <andre.guedes@openbossa.org>
Date:   Thu Jun 30 19:20:55 2011 -0300

     Bluetooth: Add lmp_host_le_capable() macro

     Since we have the extended LMP features properly implemented, we
     should check the LMP_HOST_LE bit to know if the host supports LE.

     Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
     Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
===

while that commit cannot be reverted outright due to dependencies, 
reverting it functionally fixes things for me. That is, Bluetooth works 
again after applying (to linux-3.1.6):

===
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 56943ad..c7f794e 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -540,7 +540,7 @@ int hci_dev_open(__u16 dev)
                 ret = __hci_request(hdev, hci_init_req, 0,
 
msecs_to_jiffies(HCI_INIT_TIMEOUT));

-               if (lmp_host_le_capable(hdev))
+               if (lmp_le_capable(hdev))
                         ret = __hci_request(hdev, hci_le_init_req, 0,
 
msecs_to_jiffies(HCI_INIT_TIMEOUT));
===

It seems that my adapter wasn't ready for the change. It is a:

002 Device 002: ID 1131:1004 Integrated System Solution Corp. Bluetooth 
Device

If more specific information is wanted (to add adapter-specific quirk 
handling, perhaps?) please be verbose on how to obtain it. I don't know 
anything about Bluetooth

Rene.