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USB: make the autosuspend workqueue thread freezable

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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>
This commit is contained in:
Alan Stern 2007-05-22 09:38:39 -04:00 committed by Greg Kroah-Hartman
parent 8ab5e8c0ca
commit 7ed92f1a14
1 changed files with 5 additions and 1 deletions
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6
drivers/usb/core/usb.c
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@ -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;