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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 /kernel/power/main.c
parent8400146d0dc03590bba051399e4bb7e1cbf1c010 (diff)
downloadlinux-5e928f77a09a07f9dd595bb8a489965d69a83458.tar.bz2
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 'kernel/power/main.c')
-rw-r--r--kernel/power/main.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index f710e36930cc..347d2cc88cd0 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -11,6 +11,7 @@
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/resume-trace.h>
+#include <linux/workqueue.h>
#include "power.h"
@@ -217,8 +218,24 @@ static struct attribute_group attr_group = {
.attrs = g,
};
+#ifdef CONFIG_PM_RUNTIME
+struct workqueue_struct *pm_wq;
+
+static int __init pm_start_workqueue(void)
+{
+ pm_wq = create_freezeable_workqueue("pm");
+
+ return pm_wq ? 0 : -ENOMEM;
+}
+#else
+static inline int pm_start_workqueue(void) { return 0; }
+#endif
+
static int __init pm_init(void)
{
+ int error = pm_start_workqueue();
+ if (error)
+ return error;
power_kobj = kobject_create_and_add("power", NULL);
if (!power_kobj)
return -ENOMEM;