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authorRafael J. Wysocki <rjw@sisk.pl>2010-02-08 21:18:26 +0300
committerRafael J. Wysocki <rjw@sisk.pl>2010-02-26 22:39:12 +0300
commit4cb077d93a57fb8bb64c277ec4ce637823cd76f4 (patch)
tree2035b21282c5746c869065cf917ef06c1c4c7848 /drivers/scsi/hosts.c
parent927bc9165d3cd01054b472f9b25d91a8707209c8 (diff)
downloadlinux-4cb077d93a57fb8bb64c277ec4ce637823cd76f4.tar.xz
PM: Allow SCSI devices to suspend/resume asynchronously
Set power.async_suspend for all SCSI devices, targets and hosts, so that they can be suspended and resumed in parallel with the main suspend/resume thread and possibly with other devices they don't depend on in a known way (i.e. devices which are not their parents or children). The power.async_suspend flag is also set for devices that don't have suspend or resume callbacks, because otherwise they would make the main suspend/resume thread wait for their "asynchronous" children (during suspend) or parents (during resume), effectively negating the possible gains from executing these devices' suspend and resume callbacks asynchronously. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/scsi/hosts.c')
-rw-r--r--drivers/scsi/hosts.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 554626e18062..09dbcb847b73 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -215,6 +215,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
shost->shost_gendev.parent = dev ? dev : &platform_bus;
shost->dma_dev = dma_dev;
+ device_enable_async_suspend(&shost->shost_gendev);
+
error = device_add(&shost->shost_gendev);
if (error)
goto out;
@@ -222,6 +224,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
scsi_host_set_state(shost, SHOST_RUNNING);
get_device(shost->shost_gendev.parent);
+ device_enable_async_suspend(&shost->shost_dev);
+
error = device_add(&shost->shost_dev);
if (error)
goto out_del_gendev;