Re: [PATCH] Revert "Bluetooth: Always enable management interface"

From: Gustavo Padovan
Date: Fri Mar 30 2012 - 02:55:30 EST

Hi Keith,

* Keith Packard <keithp@xxxxxxxxxx> [2012-03-28 19:35:44 -0700]:

> <#part sign=pgpmime>
> On Wed, 28 Mar 2012 23:28:39 -0300, Gustavo Padovan <gustavo@xxxxxxxxxxx> wrote:
> > A consequence is that you'll need to use newer version of bluez, at least 4.99.
> > Or call the bluetooth daemon (from a pre 4.99 version) with a parameter to
> > disable the new interface:
> That's not OK -- you're breaking user space with this kernel change. I
> know I get bashed every time I suggest that we 'fix' the kernel and
> require new user space X bits...

Can you try the following patch? It should fix the compatibility problem you had.


commit d21c1177b9cf067809ccee2746633cfea3a8b062
Author: Gustavo Padovan <gustavo@xxxxxxxxxxx>
Date: Thu Mar 29 09:47:53 2012 -0300

Bluetooth: Fix userspace compatibility issue with mgmt interface

To ensure that old user space versions do not accidentally pick up and
try to use the management channel, use a different channel number.

Reported-by: Keith Packard <keithp@xxxxxxxxxx>
Acked-by: Johan Hedberg <johan.hedberg@xxxxxxxxx>
Acked-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Signed-off-by: Gustavo Padovan <gustavo@xxxxxxxxxxx>

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 344b0f9..ba7f148 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -1327,8 +1327,8 @@ struct sockaddr_hci {
#define HCI_DEV_NONE 0xffff


struct hci_filter {
unsigned long type_mask;
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