[PATCH 4/11] USB: make the autosuspend workqueue thread freezable

This patch (as881) makes the ksuspend_usb_wq workqueue freezable.  We
don't want a rogue workqueue thread running around, unexpectedly
suspending or resuming USB devices in the middle of a system sleep
transition.

Signed-off-by: Alan Stern <[email protected]>

---

Index: usb-2.6/include/linux/workqueue.h
===================================================================
--- usb-2.6.orig/include/linux/workqueue.h
+++ usb-2.6/include/linux/workqueue.h
@@ -164,6 +164,8 @@ extern struct workqueue_struct *__create
 #define create_workqueue(name) __create_workqueue((name), 0, 0)
 #define create_freezeable_workqueue(name) __create_workqueue((name), 0, 1)
 #define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0)
+#define create_singlethread_freezeable_workqueue(name) \
+		__create_workqueue((name), 1, 1)
 
 extern void destroy_workqueue(struct workqueue_struct *wq);
 
Index: usb-2.6/drivers/usb/core/usb.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/usb.c
+++ usb-2.6/drivers/usb/core/usb.c
@@ -206,7 +206,8 @@ struct device_type usb_device_type = {
 
 static int ksuspend_usb_init(void)
 {
-	ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd");
+	ksuspend_usb_wq = create_singlethread_freezeable_workqueue(
+			"ksuspend_usbd");
 	if (!ksuspend_usb_wq)
 		return -ENOMEM;
 	return 0;


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