Re: Mutex deadlock from garmin_close in garmin_gps.c

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On Fri, 3 Apr 2009, Hal Murray wrote:

> > Here's a patch that I'm planning to submit, back-ported to 2.6.27.  It
> >  may fix your problem. 
> 
> Thanks for the quick response.
> 
> I should have mentioned that 2.6.28 and 2.6.29 also hang.  I can easily test 
> 2.6.29 so I hope the backporting wasn't much effort and/or wasn't just for me.

The patch needed to be back-ported for the stable kernel series in any
case.

> It still hangs with your patch in 2.6.27.9.
> 
> I did get some insight as to why this isn't more of a problem.  My test 
> program is probably doing something a bit strange.  It's doing open/close 
> without any reads or writes before the close.   I'll poke around more when I 
> get some time.

One thing you could do is get a stack dump (Alt-SysRq-T) while the 
driver is hung.

Alan Stern

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