[PATCH] USB: make the autosuspend workqueue thread freezable

This patch (as881b) 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.

This fixes Bugzilla #8498.

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

---

Greg:

Please revert the existing

	usb-make-the-autosuspend-workqueue-thread-freezable.patch

and apply this one in its place.  And don't forget to send it on to 
Linus soon!

Alan Stern


Index: 2.6.22-rc2/drivers/usb/core/usb.c
===================================================================
--- 2.6.22-rc2.orig/drivers/usb/core/usb.c
+++ 2.6.22-rc2/drivers/usb/core/usb.c
@@ -205,7 +205,11 @@ struct device_type usb_device_type = {
 
 static int ksuspend_usb_init(void)
 {
-	ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd");
+	/* This workqueue is supposed to be both freezable and
+	 * singlethreaded.  Its job doesn't justify running on more
+	 * than one CPU.
+	 */
+	ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd");
 	if (!ksuspend_usb_wq)
 		return -ENOMEM;
 	return 0;


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