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authorTodd Brandt <todd.e.brandt@linux.intel.com>2014-03-14 20:52:54 (GMT)
committerTejun Heo <tj@kernel.org>2014-03-18 20:08:38 (GMT)
commit200421a80f6e0a9e39d698944cc35cba103eb6ce (patch)
treeebe23c5debffa5e8cc0af395a8a7eda5fc62aaf6
parentbc6e7c4b0d1a1f742d96556f63d68f17f4e232c3 (diff)
downloadlinux-200421a80f6e0a9e39d698944cc35cba103eb6ce.tar.xz
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>
-rw-r--r--drivers/ata/libata-core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 66110ed..c37eb02 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);