From: Lin Ming <ming.m.lin@intel.com>
Date: Sat, 23 Mar 2013 03:42:27 +0000 (+0800)
Subject: block: implement runtime pm strategy
X-Git-Tag: omap-for-v3.10/fixes-for-merge-window-part2~11^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8158819d506a8aedeca53c52dfb709a0aabe011;p=pandora-kernel.git

block: implement runtime pm strategy

When a request is added:
    If device is suspended or is suspending and the request is not a
    PM request, resume the device.

When the last request finishes:
    Call pm_runtime_mark_last_busy().

When pick a request:
    If device is resuming/suspending, then only PM request is allowed
    to go.

The idea and API is designed by Alan Stern and described here:
http://marc.info/?l=linux-scsi&m=133727953625963&w=2

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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