linux-kernel - question on sound/isa/msnd/msnd

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Message-ID: <aByXJKi2j7B4b0bH@gallifrey>
Date: Thu, 8 May 2025 11:36:04 +0000
From: "Dr. David Alan Gilbert" <linux@...blig.org>
To: perex@...ex.cz, tiwai@...e.com, krzysztof.h1@...pl
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: question on sound/isa/msnd/msnd_midi.c

Hi,
   I noticed that nothing calls snd_msndmidi_new in
sound/isa/msnd/msnd_midi.c and was about to delete it, but I'm not
too sure - I think it's actually a bug where it should be called.

  This code was added in 2009 by
commit f6c638350275 ("ALSA: Turtle Beach Multisound Classic/Pinnacle driver")
(Pretty new for an ISA card!)

Looking at msnd_midi.c the only function in there that anything
calls is snd_msndmidi_input_read() called by msnd_pinnacle.c but that
is guarded by a check:

  146    if (chip->msndmidi_mpu)
  147          snd_msndmidi_input_read(chip->msndmidi_mpu);   

but I don't think anything sets that msndmidi_mpu, since the only
thing that could is snd_msndmidi_new() which isn't called.

I see that the original poster didn't test the external midi:
   https://mailman.alsa-project.org/hyperkitty/list/alsa-devel@alsa-project.org/message/CWPYLPLJQEK64UU3YFCAMVXGDY42QKF2/
so I guess this has always been missing.

I don't have the hardware to test.

Thoughts?

Dave

-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\        dave @ treblig.org |                               | In Hex /
 \ _________________________|_____ http://www.treblig.org   |_______/