Am Mittwoch, 23. Mai 2007 17:42 schrieb Alan Stern:
> On Wed, 23 May 2007, Oliver Neukum wrote:
>
> > That gives me an idea.
> > Resumption of a device has to be done in task context. So if I allocate
> > a private freezable work queue for HID resumption, the freezer would
> > guard against illicit resumptions, wouldn't it?
>
> You can use the ksuspend_usb_wq workqueue. It already exists, is
> freezable, and is used for suspending and resuming USB devices.
This adds a clean accessor for the USB core pm workqueue.
Regards
Oliver
Signed-off-by: Oliver Neukum <[EMAIL PROTECTED]>
--
--- a/include/linux/usb.h 2007-05-23 10:20:35.000000000 +0200
+++ b/include/linux/usb.h 2007-05-23 18:08:31.000000000 +0200
@@ -1343,6 +1343,8 @@ extern int usb_set_interface(struct usb_
/* this request isn't really synchronous, but it belongs with the others */
extern int usb_driver_set_configuration(struct usb_device *udev, int config);
+extern void usb_schedule_power_work(struct work_struct *work);
+
/*
* timeouts, in milliseconds, used for sending/receiving control messages
* they typically complete within a few frames (msec) after they're issued
--- a/drivers/usb/core/message.c 2007-05-22 14:50:32.000000000 +0200
+++ b/drivers/usb/core/message.c 2007-05-23 18:12:25.000000000 +0200
@@ -1648,6 +1648,22 @@ int usb_driver_set_configuration(struct
}
EXPORT_SYMBOL_GPL(usb_driver_set_configuration);
+/**
+ * usb_schedule_power_work - allow drivers to execute work in the context of
the pm thread
+ * @work: work to be executed
+ *
+ * This allows work to be scheduled which is to be executed under the
+ * same conditions pm's internal works are performed, namely to be
+ * frozen when they are frozen
+ */
+
+void usb_schedule_power_work(struct work_struct *work)
+{
+ queue_work(ksuspend_usb_wq, work);
+}
+
+EXPORT_SYMBOL(usb_schedule_power_work);
+
// synchronous request completion model
EXPORT_SYMBOL(usb_control_msg);
EXPORT_SYMBOL(usb_bulk_msg);
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