netdev - Re: [PATCH 1/2 v5] usbnet: allow status interrupt URB to always be active

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Message-ID: <CACVXFVORLr+cRV6uG0-CbYnQ4DKucforyVFcLq+B8Xwz5bVguw@mail.gmail.com>
Date:	Thu, 11 Apr 2013 20:11:13 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Dan Williams <dcbw@...hat.com>,
	Elina Pasheva <epasheva@...rrawireless.com>,
	Network Development <netdev@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	Rory Filer <rfiler@...rrawireless.com>,
	Phil Sutter <phil@....cc>
Subject: Re: [PATCH 1/2 v5] usbnet: allow status interrupt URB to always be active

On Thu, Apr 11, 2013 at 7:14 PM, Oliver Neukum <oliver@...kum.org> wrote:
>
> Sorry, I misunderstood.

No problem, :-)

>
> Task A                                  Task B                          queue
>
> queue work
>                                                 request a reset
>                                                                                         allocate memory and block
>                                                 cancel the work
>                                                                                         shit happened

If I understand the case correctly, the above deadlock can be avoided
by canceling rx/tx URBs at the end of pre_reset() or usbnet_disconnect(),
then memory can still be reclaimed in queue context since rx/tx is still
workable. Right?


Thanks,
-- 
Ming Lei
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