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Subject: Re: OOPS in 2.4.21-pre5, ide-scsi
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andre Hedrick <andre@linux-ide.org>
Cc: Willy Gardiol <gardiol@libero.it>, Jens Axboe <axboe@suse.de>,
       James Stevenson <james@stev.org>,
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       Marcelo Tosatti <marcelo@conectiva.com.br>
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On Thu, 2003-03-13 at 18:50, Andre Hedrick wrote:
> Alan,
> 
> Did we not fix this problem when HP addressed it with the ia64 stuff?

I've been working through a set of DMA problems. The PIO/DMA switching
timing out is fixed and has been for a while. I've very recently fixed a
race where we could get a command issued while resetting an interface.

With 2.4.x the reports I have make me think there are more races in
ide-scsi left. With 2.5.x its completely broken. Someone rewrote the
abort/reset handling, some other people rewrote the scsi core and the
result needs significant work yet

> Additionally I have finally found a long outstanding bug in the
> buildsgtable in ide-dma.c.  I just need to reverify the nature.  It has to
> do with the execution of the EOT bit in the last segment.  This would also
> explain why we are seeing expiry dma timeouts.

Cool
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