[PATCH 0/1] iwlwifi: trace debug messages

Andy Whitcroft apw at canonical.com
Tue Sep 4 15:08:22 UTC 2012

On Tue, Sep 04, 2012 at 10:00:05AM -0500, Seth Forshee wrote:
> On Tue, Sep 04, 2012 at 12:04:59PM +0100, Andy Whitcroft wrote:
> > On Mon, Sep 03, 2012 at 01:52:44PM +0100, Luis Henriques wrote:
> > 
> > > It looks like the issue is due to an overflow of debug messages to the
> > > kernel logs.  After bisecting the kernel, commit:
> > > 
> > > 2655e314c4b204966008689eaf3e87ba1f38d55c iwlwifi: trace debug messages
> > > 
> > > does fix the problem.  This commit had to be backported to the Precise
> > > kernel as it didn't applied cleanly.  The original bug reporter claims
> > > the issue is fixed with this backport.
> > 
> > This is rather a large patch which must fix the issue as a side effect
> > rather than really fixing the original issue.  I am not against fixing
> > this this way I guess, but it does feel a little heavy handed.  Did we
> > have any idea which debug message was triggering the crash?
> The upside of bringing in all of these changes (besides fixing the
> issue) is that we can get the messages in the trace buffer. I got a demo
> from Johannes Berg last week of how he uses the tracing in mac80211 and
> iwlwifi for debugging wirless problems, and it looks *very* useful.
> While the changes may be a bit of overkill for fixing the particular
> bug, I think they'll prove useful.

If there is a debugging upside then I am much less opposed.


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