Den 2023-01-31 kl. 16:02, skrev Takashi Iwai:
On Fri, 27 Jan 2023 16:41:42 +0100,
AiO wrote:
Hello there,
I've tried to find some insights in a weird problem I have with
snd_hdspm. I guess it is an error-report/bug-posting.
<snip>
What did I run in to?! :)
Possibly it went into the endless loop to flush the MIDI input bytes
where the hardware doesn't return the right value (likely returning
0xff constantly).
Could you check the patch below?
thanks,
Takashi
-- 8< --
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -1838,7 +1838,9 @@ static inline int snd_hdspm_midi_output_possible (struct hdspm *hdspm, int id)
static void snd_hdspm_flush_midi_input(struct hdspm *hdspm, int id)
{
- while (snd_hdspm_midi_input_available (hdspm, id))
+ int count;
+
+ for (count = 0; snd_hdspm_midi_input_available(hdspm, id) && count < 256; count++)
snd_hdspm_midi_read_byte (hdspm, id);
}
Hi again! Thank you for your fast reply. Despite it was like 20 years
since i built a Linux-kernel, i compiled a kernel (not linux-rt tho)
with this applied, sadly it still seems like it crashes on me like
before... (If i got everything right :D )
It seems I receive "seldom occurring events", but if i am a bit more
brutal, feeding events faster (randomly banging on a MIDI keyboard e.g.)
it hangs.
I did also create an issue in GitHub on this about the same time wrote
to the list:
https://github.com/alsa-project/alsa-lib/issues/297
How to go forward?
