2.4.6-ac2: "uart401: bad devc"

2.4.6-ac2: "uart401: bad devc"

[Jan Niehusmann]

Linux 2.4.6-ac2 with CONFIG_MIDI_VIA82CXXX set does cause a 
kernel hang on my setup. On the first sound I play (ie cat >/dev/dsp)
an endless stream of "uart401: bad devc" messages shows up on the 
console - everything else hangs.

Related config details:

/dev/dsp is on a sound blaster live, via82cxxx_audio is the second 
sound card (not really used). Both are loaded as modules.

emu10k1 and via82cxxx share the same interrupt (5). I assume that 
the via midi driver gets confused by the interrupt that was meant
for the sound blaster live.

If I try a kernel without CONFIG_MIDI_VIA82CXXX defined, the problem
disappears.

Jan

Re: 2.4.6-ac2: "uart401: bad devc"

[Adrian Cox]

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Jan Niehusmann wrote:

> Linux 2.4.6-ac2 with CONFIG_MIDI_VIA82CXXX set does cause a 
> kernel hang on my setup. On the first sound I play (ie cat >/dev/dsp)
> an endless stream of "uart401: bad devc" messages shows up on the 
> console - everything else hangs.


The attached patch should fix the problem.

-- 
Adrian Cox   http://www.humboldt.co.uk/

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===== drivers/sound/via82cxxx_audio.c 1.12 vs edited =====
--- 1.12/drivers/sound/via82cxxx_audio.c	Thu Jun 28 16:34:45 2001
+++ edited/drivers/sound/via82cxxx_audio.c	Mon Jul 16 10:19:52 2001
@@ -1641,7 +1641,8 @@
 	if (!(status32 & VIA_INTR_MASK))
         {
 #ifdef CONFIG_MIDI_VIA82CXXX
-                uart401intr(irq, card->midi_devc, regs);
+	    	 if (card->midi_devc)
+                    	uart401intr(irq, card->midi_devc, regs);
 #endif
 		return;
     	}