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

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Message-ID: <20120330065456.GA9173@joana>
Date:	Fri, 30 Mar 2012 03:54:56 -0300
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
	Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...el.com>
Subject: Re: [PATCH] Revert "Bluetooth: Always enable management interface"

Hi Keith,

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

> <#part sign=pgpmime>
> On Wed, 28 Mar 2012 23:28:39 -0300, Gustavo Padovan <gustavo@...ovan.org> 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.

	Gustavo
--

commit d21c1177b9cf067809ccee2746633cfea3a8b062
Author: Gustavo Padovan <gustavo@...ovan.org>
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@...thp.com>
    Acked-by: Johan Hedberg <johan.hedberg@...el.com>
    Acked-by: Marcel Holtmann <marcel@...tmann.org>
    Signed-off-by: Gustavo Padovan <gustavo@...ovan.org>

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
 
 #define HCI_CHANNEL_RAW                0
-#define HCI_CHANNEL_CONTROL    1
 #define HCI_CHANNEL_MONITOR    2
+#define HCI_CHANNEL_CONTROL    3
 
 struct hci_filter {
        unsigned long type_mask;
--
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