Re: PATA DMA problem leading to kernel panic on reading movie DVDs

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On Sunday 17 May 2009 22:30:33 Borislav Petkov wrote:
> Hi,
> 
> On Sun, May 17, 2009 at 10:18:01PM +0200, Bartlomiej Zolnierkiewicz wrote:
> > On Sunday 17 May 2009 21:50:51 Borislav Petkov wrote:
> > > On Sun, May 17, 2009 at 09:45:45PM +0200, Bartlomiej Zolnierkiewicz wrote:
> > > > On Sunday 17 May 2009 21:34:09 Borislav Petkov wrote:
> > > > > (adding Bart to CC)
> > > > > 
> > > > > Hi Bart,
> > > > > 
> > > > > please take a look at the OOPS below, seems like we BUG() in ide_intr() at
> > > > > BUG_ON(!hwif->handler) which shouldn't happen. Full message is at:
> > > > > 
> > > > > http://www.gossamer-threads.com/lists/linux/kernel/1077445.
> > > > > 
> > > > > It is 2.6.29.3 with both PIIX_IDE and ata_piix compiled and it could be
> > > > > that those two step on each other's toes, but this is only wild stab in
> > > > > the dark.
> > > > > 
> > > > > I'm sure you have more ideas.
> > > > 
> > > > Yes, see my other mail.
> > > 
> > > Saw it right after hitting send.
> > > 
> > > > [ After writing "I will cc: linux-ide on IDE/ATA problems" 100x times
> > > >   on the whiteboard... ;-) ]
> > > 
> > > And I CC'ed you instead, this has even bigger effect :)
> > 
> > Actually no.
> > 
> > I'm following all IDE discussions on linux-ide anyway and whenever I see
> > that I can help immediately I do it (and if I can't the issue gets its
> > priority level according to which it will be looked at later).  CC:ing me
> > on not fully debugged problems is not helping anything.  More likely that
> > it disrupts the work-flow since people are waiting on me instead of just
> > pushing for the solution harder...
> 
> In this case, however, it made more sense to CC you - you know that code
> better than me, you have the bunch of experience while I have to read
> a ton of stuff before I get up to speed with the problem. You, on the
> other hand, have seen similar errors like that before and can at least

You seem to forget that I'm not reading LKML regularly but I do linux-ide
(I know that the same is true for some other people) so I would have helped
much earlier if I had noticed the *initial* mail instead of the most recent
at the time...

> have a hunch - and you did. Besides, it's not like I'm waiting for you
> - I have other things on my plate which I could tackle while you handle
> the case you're more knowledgeable at. It is simple as that.

That is missing the point -- we are not the only knowledgeable ones here
and we definitely want to encourage other people to attack the problems.

[ Please read my mail again.  I explicitly said "people" not "you" there. ]

> But I'll start CCing linux-ide if that's your preference.

Thanks but my preferences are not the point here.  That is just the most
efficient way for everybody: IDE/ATA problems should be handled at linux-ide
mailing list.  You can still cc: me but cc:ing linux-ide takes priority.

Thanks.
Bart
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