Re: ALSA crash

[Takashi Iwai <tiwai@suse.de>]

At Fri, 19 Jul 2002 16:49:20 +0530,
Shaju Abraham wrote:
> 
> Hi,
>         Pls check the attached file that is dmesg of a ALSA crash. Can
> you pls tell under what conditions this happens?
 
which kernel are you using?  is it a modified one?
the message appears when the interrupt is generated more lately than
expected.  so it might be a hardware problem, but not always true.
especially onboard chip there could be workaround on the driver side.

> Another thing ... in pcm_lib.c , for the funtion  snd_pcm_update_hw_ptr.
> , there is a comment that "this should be called with interrupts
> disabled". Can you tell us who is disabling the interrupts just before
> this is called?

snd_pcm_update_hw_ptr() is called from either during read/write
syscall or tick callback.  most likely the former case.
anyway it would be nice if you can track down from where it's called.

(note that snd_pcm_update_hw_ptr_interrupt() is called from the
 lowlevel driver's interrupts)


> Does spin_lock_irq do that?
 
in most cases, yes.
but you don't need take care of that, unless you call it directly from
somewhere.


Takashi


-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf