[PATCHSET] sata_sil: implement Mod15Write workaround by split request processing

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Hello, Jeff.

This is updated version of the Mod15Write workaround I've been
maintaining for a year now.  This patchset contains the following
patches.

#01-03 : Prepare libata for m15w workaround.  All three patches are
	 justifiable by themselves.
#04    : implement Mod15Write workaround by split request processing

The core split processing code is in production use on many machines
and I haven't heard about malfucntion for a very long time, so I
suppose they're pretty stable.

For mainline inclusion, I've added code to handle PIO mode.  When the
device is switched to PIO mode, sata_sil turns of split request
processing and limits max_sectors to 15 and vice versa when it exits
PIO mode.

This patchset is against the current #upstream
(da54f5fe54c7d75e2db7d17961fb36a8c28a8501).

Thanks.

--
tejun


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