Re: [PATCH v6 1/2] PCI/MSI: Don't disable MSI/MSI-X at shutdown

From: Michael S. Tsirkin
Date: Thu May 14 2015 - 02:06:13 EST

On Wed, May 13, 2015 at 08:41:55AM +0200, Michael S. Tsirkin wrote:
> > This also sounds like a case for implementing a shutdown callback and
> > disabling things properly. A properly shutdown driver should have
> > already disabled MSI's. A driver is responsible for enabling MSIs so it
> > should be responsible for disabling it. The core disabling MSIs is
> > mostly to catch the handful of lazy drivers that forget.
> Okay! And I am saying that if the driver did forget,
> we are better off not disabling it - leave it enabled
> until kexec starts and disables it.
> > The bottom line is that there are a few things that are standard
> > behavior that we can do in the generic code, but at the end of the day
> > it is the responsibility of the driver to shut things down and whatever
> > driver you are dealing with clearly has a bunch of bugs and you aren't
> > fixing it.
> So please let us get on with fixing it in driver and stop
> playing with device in core.

Eric, does this argument make sense? Drivers should do the right thing
in their shutdown callback, let's not try to work around their bugs in

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