Re: [axp] Re: qlogic problem in pre3-2.3.44

[Peter Rival]

FYI, I tried out 2.3.45 and the same problems still exist.  If someone could point
me to the debug stuff that lead y'all to these conclusions, I'd be happy to play
some more.

 - Pete

"David S. Miller" wrote:

>    Date:   Sat, 12 Feb 2000 17:31:27 -0800
>    From: Richard Henderson <[e-mail]>
>
>    > qlogic driver doesn't squirrel away the count of entries returned by
>    > pci_map_sg and when it comes time to free the list, often does too
>    > many entries and runs into some bogus ones, causing panics in pci_free_sg.
>
>    This probably isn't fully correct, but a similar change to the sym
>    driver appears to work under load.  If it's wrong it's going to fail
>    on scsi errors, which I don't know how to force.
>
>  ...
>
>    Thoughts on a better way to fix?
>
> pci_{unmap,dma_sync}_sg should be passed the same "nents" which was
> passed into pci_map_sg, not the one returned from the latter.
>
> Fix the Alpha iommu code please :-)  This mechanism was specifically
> chosen such that the scsi drivers did not have to keep track of this
> secondary dma 'nents' value.  Thanks.
>
> Later,
> David S. Miller
> [e-mail]
>
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