From 7ed92f1a149dddc3cb537ccd7441e98adac12c3e Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 22 May 2007 09:38:39 -0400
Subject: [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 <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/core/usb.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 18ddc5e67e390..80627b6a2bf96 100644
--- a/drivers/usb/core/usb.c
+++ b/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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