From: Todd Brandt <todd.e.brandt@linux.intel.com>
Date: Fri, 14 Mar 2014 20:52:54 +0000 (-0700)
Subject: libata: async resume
X-Git-Tag: v3.15-rc1~161^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=200421a80f6e0a9e39d698944cc35cba103eb6ce;p=pandora-kernel.git

libata: async resume

Improve overall system resume time by making libata link recovery
actions asynchronous relative to other resume events.

Link resume operations are performed using the scsi_eh thread, so
commands, particularly the sd resume start/stop command, will be held
off until the device exits error handling.  Libata already flushes eh
with ata_port_wait_eh() in the port teardown paths, so there are no
concerns with async operation colliding with the end-of-life of the
ata_port object.  Also, libata-core is already careful to flush
in-flight pm operations before another round of pm starts on the given
ata_port.

Reference: https://01.org/suspendresume/blogs/tebrandt/2013/hard-disk-resume-optimization-simpler-approach

Cc: Len Brown <len.brown@intel.com>
Cc: Phillip Susi <psusi@ubuntu.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Todd Brandt <todd.e.brandt@linux.intel.com>
[djbw: rebase on cleanup patch, changelog wordsmithing]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

Reading git-diff-tree failed