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

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Date:	Mon, 26 Jul 2010 21:20:27 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	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, 2010-07-23 at 14:56 +0100, Ben Hutchings 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>

Looks good to me.

cheers


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