[PATCH] PCI: MSI: Restore read_msi_msg_desc(); add get_cached_msi_msg_desc()

Michael Ellerman michael at ellerman.id.au
Mon Jul 26 21:20:27 EST 2010

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 at solarflare.com>

Looks good to me.


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