[alsa-devel] Current ad1848/cs4231 mce_down code

Krzysztof Helt krzysztof.h1 at gmail.com
Tue Sep 18 09:28:21 CEST 2007

On Tue, 18 Sep 2007 02:53:28 +0200
Rene Herman <rene.herman at gmail.com> wrote:

> At (---) we are no longer atomic, so imagine being pre-empted there. When we 
> get back, we may/will well be past end_time and although by now calibration 
> has long finished, we bail out believing we've timed out.
Good catch.

> Moreover, we aren't under lock at all in the cs4231 version (which also 
> means that msleep(1) thing is in fact fine there). Can't we do that for 
> ad1848 as well?

The lock is right thing to do as Trent found out. The in() call writes
to register. On the SMP setup it may backfire (cs4231 does not have
locks but sparc cs4231 has them).


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