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From: Oliver Neukum <oliver@neukum.org>
To: Johannes Berg <johannes@sipsolutions.net>,
       linux-usb-devel@lists.sourceforge.net
Subject: Re: [PATCH] hci_usb: implement suspend/resume
Date: Wed, 18 Jan 2006 14:25:34 +0100
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Am Mittwoch, 18. Januar 2006 00:21 schrieb Johannes Berg:
> The attached patch implements suspend/resume for the hci_usb bluetooth
> driver by simply killing all outstanding urbs on suspend, and re-issuing
> them on resume.
> 
> This allows me to actually use the internal bluetooth "dongle" in my
> powerbook after suspend-to-ram without taking down all userland programs
> (sdpd, ...) and the hci device and reloading the module.
> 
> Signed-Off-By: Johannes Berg <johannes@sipsolutions.net>
> 
> --- linux-2.6.15.1.orig/drivers/bluetooth/hci_usb.c	2006-01-18 00:08:54.840000000 +0100
> +++ linux-2.6.15.1/drivers/bluetooth/hci_usb.c	2006-01-18 00:06:35.080000000 +0100
> @@ -1043,11 +1043,55 @@
>  	hci_free_dev(hdev);
>  }
>  
> +static int hci_usb_suspend(struct usb_interface *intf, pm_message_t message)
> +{
> +	struct hci_usb *husb = usb_get_intfdata(intf);
> +	int i;
> +	unsigned long flags;
> +	if (!husb || intf == husb->isoc_iface)
> +		return 0;
> +	
> +	for (i = 0; i < 4; i++) {
> +		struct _urb_queue *q = &husb->pending_q[i];
> +		struct _urb *_urb;
> +		spin_lock_irqsave(&q->lock, flags);
> +		list_for_each_entry(_urb, &q->head, list)
> +			usb_kill_urb(&_urb->urb);
> +		spin_unlock_irqrestore(&q->lock, flags);
> +	}
> +	return 0;

This patch is wrong. usb_kill_urb() will sleep. You must not use it under
a spinlock.

	Regards
		Oliver