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authorRafael J. Wysocki <rjw@sisk.pl>2010-01-27 23:47:38 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2010-02-26 20:39:11 +0100
commitf8824cee405c62ba465b85365201166d9cf86a14 (patch)
tree90020be3264ff98bad2f14759127a2d9693673d8 /drivers/base
parent97df8c12995c5bac73e3bfeea4c5be155c1f4401 (diff)
downloadop-kernel-dev-f8824cee405c62ba465b85365201166d9cf86a14.zip
op-kernel-dev-f8824cee405c62ba465b85365201166d9cf86a14.tar.gz
PM: Allow device drivers to use dpm_wait()
There are some dependencies between devices (in particular, between EHCI USB controllers and their OHCI/UHCI siblings) which are not reflected by the structure of the device tree. With synchronous suspend and resume these dependencies are taken into accout automatically, because the devices in question are always registered in the right order, but to meet these constraints with asynchronous suspend and resume the drivers of these devices will need to use dpm_wait() in their suspend/resume routines, so introduce a helper function allowing them to do that. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/main.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 6efef9f..0e26a6f 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1046,3 +1046,14 @@ void __suspend_report_result(const char *function, void *fn, int ret)
printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret);
}
EXPORT_SYMBOL_GPL(__suspend_report_result);
+
+/**
+ * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
+ * @dev: Device to wait for.
+ * @subordinate: Device that needs to wait for @dev.
+ */
+void device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
+{
+ dpm_wait(dev, subordinate->power.async_suspend);
+}
+EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
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