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Date: Sat, 11 Sep 2010 01:01:59 -0700
From: perryh@pluto.rain.com
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Cc: freebsd-stable@freebsd.org
Subject: Re: MSIX failure
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John Baldwin <jhb@freebsd.org> wrote:
> On Friday, September 10, 2010 2:55:15 am perryh@pluto.rain.com wrote:
> > ...
> > It is arguably a bug to open O_RDWR when only examining things.
>
> You have to have RDWR permission to issue the ioctl to read config
> registers which pciconf does when examining capabilities.

So much for avoiding a reboot for <bsd@lordcow.org> (or whatever the
correct address is -- that one bounced), but now it is beginning to
look as if there may be a POLA violation at a lower level.  Unless
there are devices out there whose state can be changed by merely
_reading_ (not writing) their configuration registers, I would not
expect to need RDWR permission just to read them.