linux-kernel - Re: [PATCH] PCI: MSI: Restore read_msi_msg_desc(); add get_cached_msi_msg

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Date:	Sun, 01 Aug 2010 16:23:45 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-pci <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] PCI: MSI: Restore read_msi_msg_desc(); add
 get_cached_msi_msg_desc()

On Fri, 2010-07-30 at 09:42 -0700, Jesse Barnes wrote:
> On Fri, 23 Jul 2010 14:56:28 +0100
> Ben Hutchings <bhutchings@...arflare.com> wrote:
> 
> > commit 2ca1af9aa3285c6a5f103ed31ad09f7399fc65d7 "PCI: MSI: Remove
> > unsafe and unnecessary hardware access" changed read_msi_msg_desc() to
> > return the last MSI message written instead of reading it from the
> > device, since it may be called while the device is in a reduced
> > power state.
> > 
> > However, the pSeries platform code really does need to read messages
> > from the device, since they are initially written by firmware.
> > Therefore:
> > - Restore the previous behaviour of read_msi_msg_desc()
> > - Add new functions get_cached_msi_msg{,_desc}() which return the
> >   last MSI message written
> > - Use the new functions where appropriate
> > 
> > Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> > ---
> > Compile-tested only.
> > 
> 
> Applied to linux-next with Michael's ack, thanks.  I hope it actually
> works, I didn't see a tested-by!

I assume Stephen has been using it, otherwise his linux-next boot tests
will all have been failing. Either way he'll test it when it gets into
linux-next proper.

cheers



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