linux-kernel - Re: bluetooth in v4.13-rc1: lock init missing somewhere?

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Date:   Sun, 23 Jul 2017 10:26:54 +0200
From:   Pavel Machek <pavel@....cz>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        linux-bluetooth@...r.kernel.org,
        "Gustavo F. Padovan" <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Subject: Re: bluetooth in v4.13-rc1: lock init missing somewhere?

Hi!

> > I guess output just after boot will be more interesting?
> > 
> > root@...0:/my/modules# insmod hci_nokia.ko
> > root@...0:/my/modules#
> > Message from syslogd@...alhost at Jul 19 12:24:00 ...
> > kernel:[  174.363037] BUG: rwlock bad magic on CPU#0,
> > kworker/u3:0/3027, c2665a48
> > 
> > root@...0:/my/modules# ../bluez-5.26/tools/btmgmt public-addr
> > 01:02:03:04:05:06
> > Set Public Address for hci0 failed with status 0x0b (Rejected)
> > root@...0:/my/modules# ../bluez-5.26/tools/btmgmt power on
> > Set Powered for hci0 failed with status 0x11 (Invalid Index)
> > root@...0:/my/modules#
> 
> if you manage to get a recent btmon then it will also decode all the
 > the unknown packets. That would be interesting since it tells you
 > exactly what mgmt sends and what also legacy tools do at any given
 > time.

Let me try:

pavel@...0:/my/bluez$ autoconf
configure.ac:4: error: possibly undefined macro: AM_INIT_AUTOMAKE
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:11: error: possibly undefined macro: AM_MAINTAINER_MODE
configure.ac:24: error: possibly undefined macro: AM_PROG_CC_C_O
configure.ac:25: error: possibly undefined macro: AC_PROG_CC_PIE
configure.ac:32: error: possibly undefined macro: AC_DISABLE_STATIC
configure.ac:33: error: possibly undefined macro: AC_PROG_LIBTOOL
configure.ac:41: error: possibly undefined macro: AM_CONDITIONAL
pavel@...0:/my/bluez$ ./configure 
./configure: line 2189: syntax error near unexpected token `foreign'
./configure: line 2189: `AM_INIT_AUTOMAKE(foreign subdir-objects color-tests silent-rules'
pavel@...0:/my/bluez$ 

automake; autoconf results in less warnings out of autoconf.

In the end I just deleted the offending line.

But then it ends here:

./configure: line 4043: AM_PROG_CC_C_O: command not found
./configure: line 4044: AC_PROG_CC_PIE: command not found
configure: error: cannot find install-sh, install.sh, or shtool in "."
"./.." "./../.."
pavel@...0:/my/bluez$


> > While btmon says:
> > 
> > ...begining of buffer lost :-(
> 
> I really need to find my patches for the monitor ring-buffer and
 > replay support so that you can keep these in kernel memory and
 > configure this with a kernel cmdline option. In theory however
 > starting btmon before insmod should be plenty to get the full
 > trace.

That was my fault, not kernel fault. I just relied on scrollback
buffer, and it was not big enough.

> 
> Actually I just realize that this is special anyway. Since this is Nokia manufacture ID, but Broadcom vendor decoding. I think that we need to add some special handling for this to make sure user space is able to decode this properly.
> 

Aha. Ok, I guess I can test out the patches... if I manage to compile
it. Adding a hint how to compile from git (-> configure not present)
would be nice.

> While we do this the btbcm_set_bdaddr might be actually empty.
> 
> config BT_HCIUART_NOKIA                                                          
>         tristate "UART Nokia H4+ protocol support"                               
>         depends on BT_HCIUART                                                    
>         depends on BT_HCIUART_SERDEV                                             
>         depends on PM                                                            
>         select BT_HCIUART_H4                                                     
> 
> This is missing the select BT_BCM like what we have for the hci_bcm.c support.
> 
> config BT_HCIUART_BCM                                                            
>         bool "Broadcom protocol support"                                         
>         depends on BT_HCIUART                                                    
>         select BT_HCIUART_H4                                                     
>         select BT_BCM
> 
> Can you try to enable btbcm.ko module and load that first.

Actually, I guess I can just make it build-in. But I'm not sure how it
is supposed to help: I'd expect undefined symbols on broken
dependency, not silent failure.

Thanks,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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