Messages in this thread | | | Date | Mon, 22 Sep 2003 20:19:21 +0100 | From | Jamie Lokier <> | Subject | Re: Can we kill f inb_p, outb_p and other random I/O on port 0x80, in 2.6? |
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Eric W. Biederman wrote: > Alan, can you describe a little more what the original delay is needed > for? I don't see it documented in my 8254 data sheet. The better I > can understand the problem the better I can write the comments on this > magic bit of code as I fix it. > > The oldest machine I have is a 386 MCA system. Any chance of the bug > showing up there? I'd love to have a test case. > > Another reason for fixing this is we are killing who knows how much > I/O bandwidth with this stream of failing writes to port 0x80.
Unfortunately, a lot of drivers use the _p operators so if the delay is simply removed, it may take a while before the ill effects of that are discovered.
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