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| author | Todd Brandt <todd.e.brandt@linux.intel.com> | 2014-03-14 13:52:54 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-03-18 16:08:38 -0400 |
| commit | 200421a80f6e0a9e39d698944cc35cba103eb6ce (patch) | |
| tree | ebe23c5debffa5e8cc0af395a8a7eda5fc62aaf6 /drivers/ata | |
| parent | bc6e7c4b0d1a1f742d96556f63d68f17f4e232c3 (diff) | |
| download | lwn-200421a80f6e0a9e39d698944cc35cba103eb6ce.tar.gz lwn-200421a80f6e0a9e39d698944cc35cba103eb6ce.zip | |
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>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-core.c | 2 |
1 files changed, 1 insertions, 1 deletions
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); |