linux-kernel - Re: lockdep warning in urb.c:363 usb_submit

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Date:   Mon, 23 Mar 2020 16:36:09 +0100
From:   Oliver Neukum <oneukum@...e.de>
To:     Qais Yousef <qais.yousef@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: lockdep warning in urb.c:363 usb_submit_urb

Am Montag, den 23.03.2020, 14:38 +0000 schrieb Qais Yousef:
> Hi
> 
> I've hit the following lockdep warning when I trigger hibernate on arm64
> platform (Juno-r2)
> 
> 
> 	echo suspend > /sys/power/disk
> 	echo disk > /sys/power/state
> 
> I only had a usb flash drive attached to it. Let me know if you need more info.

Hi,

that is not a lockdep issue, but the hub driver is not properly killing
its URB presumably. Yet, the driver looks correct to me. Please use
the additional patch and activate dynamic debugging for usbcore.

	Regards
		Oliver

View attachment "0001-usb-hub-additional-debugging.patch" of type "text/x-patch" (683 bytes)