From: Tejun Heo <htejun@gmail.com>
Date: Sun, 23 Sep 2007 04:14:12 +0000 (+0900)
Subject: libata-pmp-prep: implement qc_defer helpers
X-Git-Tag: v2.6.24-rc1~1391^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da917d69d0ea63f5390716cba6e77f490ce96df9;p=pandora-kernel.git

libata-pmp-prep: implement qc_defer helpers

Implement ap->nr_active_links (the number of links with active qcs),
ap->excl_link (pointer to link which can be used by ->qc_defer and is
cleared when a qc with ATA_QCFLAG_CLEAR_EXCL completes), and
ata_link_active().

These can be used by ->qc_defer() to implement proper command
exclusion.  This set of helpers seem enough for both sil24 (ATAPI
exclusion needed) and cmd-switching PMP.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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