netdev - Re: [PATCH 01/12] usbnet: introduce usbnet 3 command helpers

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Message-ID: <CACVXFVPoh5+GAFHP0n9_CqYaCaKnUreL_-82e_=y1vzpaE4+zA@mail.gmail.com>
Date:	Fri, 12 Oct 2012 23:33:24 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org, jkosina@...e.com
Subject: Re: [PATCH 01/12] usbnet: introduce usbnet 3 command helpers

On Fri, Oct 12, 2012 at 11:17 PM, Ming Lei <ming.lei@...onical.com> wrote:

> Suppose mutex_lock(A) is called in pre_reset(), one solution is that
> always calling tsk_set_allowd_gfp(~GFP_IOFS) before each mutex_lock(A).
> We can do it only for devices with storage interface in current
> configuration.

The problem will become quite complicated if a 3rd, even 4th,... context
is involved in the task dependency.

But I am wondering if there are such practical examples wrt. usb
mass storage.

Thanks,
--
Ming Lei
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