DragonFly bugs List (threaded) for 2009-01
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Re: [issue1240] sata dvdrom leads to interrupt livelock
Matthew Dillon wrote:
Those BMSTAT bits aren't part of the standard at all (that I know of),
but they are the only way to be able to tell if an ATA device is
actually the source of an interrupt when multiple devices share the
same interrupt.
Yes, that's the busmaster interrupt status. The problem is that the drive
doesn't set the busmaster error, but instead only the ata status error.
On the face of it it does seem as though we should be able to return
1 if ATA_BMSTAT_INTERRUPT is set and either ATA_BMSTAT_ERROR is
set or ATA_BMSTAT_ACTIVE is clear. It is unclear to me whether
we can safely clear the ACTIVE bit, though, which is what that
next ATA_IDX_OUTB() will do if we allow the ERROR + INTERRUPT case
through. Then again, maybe we have to. I just don't know.
You can't clear ACTIVE, it is readonly. We'd have to abort the busmaster
transaction, and that's where I don't know what to do. I'll have to try
and see.
cheers
simon
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