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-Url: https://git.stricted.de/?a=commitdiff_plain;h=200421a80f6e0a9e39d698944cc35cba103eb6ce;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.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>
---

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 66110ed2c1c0..c37eb02c7136 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5450,7 +5450,7 @@ static void ata_port_resume_async(struct ata_port *ap, pm_message_t mesg)
 
 static int ata_port_pm_resume(struct device *dev)
 {
-	ata_port_resume(to_ata_port(dev), PMSG_RESUME);
+	ata_port_resume_async(to_ata_port(dev), PMSG_RESUME);
 	pm_runtime_disable(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);