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authorRafael J. Wysocki <rjw@sisk.pl>2009-08-18 23:38:32 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2009-08-23 00:04:44 +0200
commit5e928f77a09a07f9dd595bb8a489965d69a83458 (patch)
treeef53ec90fa3214fd22e36b07c11c06b09e373d8d /drivers/base/dd.c
parent8400146d0dc03590bba051399e4bb7e1cbf1c010 (diff)
downloadop-kernel-dev-5e928f77a09a07f9dd595bb8a489965d69a83458.zip
op-kernel-dev-5e928f77a09a07f9dd595bb8a489965d69a83458.tar.gz
PM: Introduce core framework for run-time PM of I/O devices (rev. 17)
Introduce a core framework for run-time power management of I/O devices. Add device run-time PM fields to 'struct dev_pm_info' and device run-time PM callbacks to 'struct dev_pm_ops'. Introduce a run-time PM workqueue and define some device run-time PM helper functions at the core level. Document all these things. Special thanks to Alan Stern for his help with the design and multiple detailed reviews of the pereceding versions of this patch and to Magnus Damm for testing feedback. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@igel.co.jp>
Diffstat (limited to 'drivers/base/dd.c')
-rw-r--r--drivers/base/dd.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index f010687..7b34b3a 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -23,6 +23,7 @@
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/async.h>
+#include <linux/pm_runtime.h>
#include "base.h"
#include "power/power.h"
@@ -202,7 +203,10 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
drv->bus->name, __func__, dev_name(dev), drv->name);
+ pm_runtime_get_noresume(dev);
+ pm_runtime_barrier(dev);
ret = really_probe(dev, drv);
+ pm_runtime_put_sync(dev);
return ret;
}
@@ -245,7 +249,9 @@ int device_attach(struct device *dev)
ret = 0;
}
} else {
+ pm_runtime_get_noresume(dev);
ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
+ pm_runtime_put_sync(dev);
}
up(&dev->sem);
return ret;
@@ -306,6 +312,9 @@ static void __device_release_driver(struct device *dev)
drv = dev->driver;
if (drv) {
+ pm_runtime_get_noresume(dev);
+ pm_runtime_barrier(dev);
+
driver_sysfs_remove(dev);
if (dev->bus)
@@ -324,6 +333,8 @@ static void __device_release_driver(struct device *dev)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
+
+ pm_runtime_put_sync(dev);
}
}
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