snd_mpu401_uart: hang when trying to play .mid

[Domen Puncer <domen@coderock.org>]

Hi.

"hang" here means: not even alt+sysrq+p responds

I tried to play some .mid files with kmid, I wouldn't be suprised if
it didn't work, but it *hanged* the computer!

2 messages appeared on console (retyped):
cmd: 0xff failed at 0x20 (status = 0x50, data = 0x0)
cmd: 0x3f failed at 0x20 (status = 0x3f, data = 0x3)

These messages come from mpu401_uart.c:snd_mpu401_uart_cmd
It seems like commands MPU401_RESET and MPU401_ENTER_UART fail,
but code continues, ignoring that.

At this point it might be clear to alsa developers why/when hang
occours, if not I'll provide more data next weekend.



kernel: 2.6.9-rc1-bk7

modules:
snd_trident            42344  1 
snd_util_mem            3904  1 snd_trident
snd_mpu401_uart         7040  1 snd_trident
snd_ens1371            22760  0 
snd_rawmidi            22820  2 snd_mpu401_uart,snd_ens1371
snd_ac97_codec         66064  2 snd_trident,snd_ens1371
(don't have the ens1371 card inside, at the moment)

domen@masina:~/kernel/a$ cat /proc/asound/cards 
0 [SI7018         ]: SI7018 - SiS SI7018
                     SiS SI7018 PCI Audio at 0xd800, irq 11
domen@masina:~/kernel/a$ cat /proc/asound/devices 
  1:       : sequencer
  0: [0- 0]: ctl
  8: [0- 0]: raw midi
 17: [0- 1]: digital audio playback
 16: [0- 0]: digital audio playback
 24: [0- 0]: digital audio capture
 33:       : timer



	Domen


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