Messages in this thread | | | Date | Sun, 16 Mar 2008 12:39:43 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: Linux 2.6.25-rc4 |
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On Sun, 16 Mar 2008, Alan Cox wrote: > > No it doesn't. DRQ simply means "drive has more data for the controller > if you want it". Interrupts are controlled via IEN and the interrupt line.
A _lot_ of chips require you to clear the DRQ by taking the data they have.
> If the drive wants to give us data and we end the transaction that is > fine. In practice a tiny few devices crap themselves if we don't.
More than a few tiny devices from what I remember. It tends to be the other way around - most devices do *not* want to get new commands until you've finished the previous one by draining the queues.
Linus
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