From: Tejun Heo <htejun@gmail.com>
Date: Wed, 31 May 2006 09:27:32 +0000 (+0900)
Subject: [PATCH] libata-hp-prep: make some ata_device fields persistent
X-Git-Tag: v2.6.18-rc1~1079^2~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=72fa4b742b327bd1b07985d79a61c61dbd9fd4e6;p=pandora-kernel.git

[PATCH] libata-hp-prep: make some ata_device fields persistent

Lifetimes of some fields span over device plugging/unplugging.  This
patch moves such persistent fields to the top of ata_device and
separate them with ATA_DEVICE_CLEAR_OFFSET.  Fields above the offset
are initialized once during host initializatino while all other fields
are cleared before hotplugging.  Currently ->ap, devno and part of
flags are persistent.

Note that flags is partially cleared while holding host_set lock.
This is to synchronize with later warm plug implementation which will
record hotplug request in dev->flags.

Signed-off-by: Tejun Heo <htejun@gmail.com>
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