linux-kernel - Re: 3.10-rc: bluetooth disappeared on thinkpad x60 (regression)

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Date:	Tue, 11 Jun 2013 13:20:25 +0300
From:	Johan Hedberg <johan.hedberg@...il.com>
To:	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	kernel list <linux-kernel@...r.kernel.org>,
	marcel@...tmann.org, gustavo@...ovan.org,
	linux-bluetooth@...r.kernel.org
Subject: Re: 3.10-rc: bluetooth disappeared on thinkpad x60 (regression)

Hi Pavel,

On Tue, Jun 11, 2013, Johan Hedberg wrote:
> On Mon, Jun 10, 2013, Pavel Machek wrote:
> > < HCI Command: Delete Stored Link Key (0x03|0x0012) plen 7
> >     bdaddr 00:00:00:00:00:00 all 1
> > > HCI Event: Command Complete (0x0e) plen 4
> >     Delete Stored Link Key (0x03|0x0012) ncmd 1
> >     status 0x11 deleted 0
> >     Error: Unsupported Feature or Parameter Value
> 
> Here's the cause of your issue. It's not one of the recently added HCI
> commands but one that's been around for quite some time. I just checked
> and it's even there in kernel 3.9, so I'm surprised that you're saying
> this is a regression since that version. Are you completely sure about
> it?

Could you try if the attached patch helps? It modifies the HCI request
state tracking to allow flagging certain HCI commands as non-critical
and just ignores their failures.

If the patch helps, could you still provide a HCI trace (both plain text
and btsnoop format) of a successful "hciconfig hci0 up"? It might help
create a simpler patch for this issue.

Johan

View attachment "del_link_keys.patch" of type "text/plain" (3191 bytes)