From: Marcel Holtmann <marcel@holtmann.org>
To: Jeremy Jackson <jerj@coplanar.net>
Cc: linux-bluetooth@vger.kernel.org
Subject: Re: btusb regression on commands unsupported by adapter
Date: Fri, 18 Dec 2009 13:53:26 -0800 [thread overview]
Message-ID: <1261173206.4041.89.camel@localhost.localdomain> (raw)
In-Reply-To: <1261158272.4932.184.camel@ragnarok>
Hi Jeremy,
> I've posted more details here for userspace diagnosis/workaround,
>
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/377225
>
> Some (older?) BT adapters don't support the commands 'Read Default Link
> Policy Settings'
> 'Write Default Link Policy Settings'
>
> as shown by # hciconfig hci0 commands
>
> This appears be one cause of the infamous kernel message: hci0: command
> tx timeout. This in turn causes bluetoothd to give up and take down the
> interface.
>
> If you kill bluetoothd, and manually # hciconfig hci0 up, you can
> discover and inq devices no problem.
>
> I made a patch to disable the offending command, and the above mentioned
> bug report I gave instructions to gather data on adapter BT version,
> supported features, and supported commands. Hopefully some user reports
> can be used to make use of the command conditional on actual adapter
> support.
>
> The question for kernel side is, regression, or corrected behaviour?
this is basically a bluetoothd issue. We should be reading the list of
supported commands and then either issue or not issue this command. Feel
free to write a patch for that.
Regards
Marcel
next prev parent reply other threads:[~2009-12-18 21:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-18 17:44 btusb regression on commands unsupported by adapter Jeremy Jackson
2009-12-18 21:53 ` Marcel Holtmann [this message]
2009-12-23 13:51 ` Stefan Seyfried
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1261173206.4041.89.camel@localhost.localdomain \
--to=marcel@holtmann.org \
--cc=jerj@coplanar.net \
--cc=linux-bluetooth@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox