From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Hofman <pavel.hofman@insite.cz>
Subject: Re: PATCH - MIDI on ice1724 - real-time kernel problem
 SOLVED(?)
Date: Fri, 27 Jun 2008 15:54:41 +0200
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To: =?ISO-8859-1?Q?Martin_Kr=FCger?= <m_a_krueger@gmx.de>
Cc: alsa-devel@alsa-project.org
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Martin Kr=FCger wrote:
> Martin Kr=FCger schrieb:
>> Hi Pavel,
>>
>> sorry for the long break, i was really busy at studying.
>>
>> ---snip---
>>
>> Thanks a lot,
>> Martin
>> _______________________________________________
>> Alsa-devel mailing list
>> Alsa-devel@alsa-project.org
>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>>   =

> =

> Hi again,
> =

> i did some other playing around this evening. (Debugging would be a word =

> much too big...)
> =

> I commented out the logic stuff in the following subroutines of the =

> ice1724.c:
> =

> - static int vt1724_midi_output_open(struct snd_rawmidi_substream *s)
> - static int vt1724_midi_output_close(struct snd_rawmidi_substream *s)
> - static void vt1724_midi_output_trigger(struct snd_rawmidi_substream =

> *s, int up)
> - static void vt1724_midi_output_drain(struct snd_rawmidi_substream *s)
> =

> The vt1724_enable_midi_irq(s, VT1724_IRQ_MPU_TX, 1) is killing my =

> kernel, i don't know why.

So enabling the MPU TX interrupt causes lockup. Very similar to my =

experience with the previous version of the MIDI driver. Please put a =

debug line to snd_vt1724_interrupt, listing status bits for each =

interrupt. That was the place I experienced loops etc. In my case the =

flood eventually fooled the logging facility, but I could still read the =

first few logs.


> On the input side everything works, so i am a bit confused. Again. ;-)

I was also getting only TX interrupt floods, RX was OK.

Good luck,


Pavel.