[PATCH] USB: make kernel threads non-freezable

This patch (as1012) makes the khubd and ksuspend_usbd kernel threads
non-freezable.  Since the PM core has been changed to lock all devices
during a system sleep, these threads no longer need to be frozen.
They won't interfere with a system sleep because before trying to
resume a device, they acquire the device's lock.

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

---

Index: usb-2.6/drivers/usb/core/hub.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/hub.c
+++ usb-2.6/drivers/usb/core/hub.c
@@ -21,7 +21,6 @@
 #include <linux/usbdevice_fs.h>
 #include <linux/kthread.h>
 #include <linux/mutex.h>
-#include <linux/freezer.h>
 
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
@@ -2865,10 +2864,9 @@ loop:
 
 static int hub_thread(void *__unused)
 {
-	set_freezable();
 	do {
 		hub_events();
-		wait_event_freezable(khubd_wait,
+		wait_event(khubd_wait,
 				!list_empty(&hub_event_list) ||
 				kthread_should_stop());
 	} while (!kthread_should_stop() || !list_empty(&hub_event_list));
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
@@ -230,7 +230,7 @@ static int ksuspend_usb_init(void)
 	 * singlethreaded.  Its job doesn't justify running on more
 	 * than one CPU.
 	 */
-	ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd");
+	ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd");
 	if (!ksuspend_usb_wq)
 		return -ENOMEM;
 	return 0;


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