linux-kernel - Re: [RFC PATCH 3/3] USB: forbid memory allocation with I/O during bus reset if storage interface exits

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Message-ID: <CACVXFVPi=fq1NP-nuWQi34xTpGgWbaceW1Hbzcq38RqQMF_T-w@mail.gmail.com>
Date:	Mon, 15 Oct 2012 20:06:36 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RFC PATCH 3/3] USB: forbid memory allocation with I/O during bus
 reset if storage interface exits

On Mon, Oct 15, 2012 at 5:34 PM, Oliver Neukum <oneukum@...e.de> wrote:
>
> I think limiting this to devices which have a storage device is not
> productive. What if you are using iSCSI or nbd? In the long run

You mean other non-mass storage or non-uas usb interfaces may
be involved in iSCSI or nbd? If not, the patch should be OK.
If yes, could you list them?

> we will see busses attached to busses and as soon as the daughter
> bus is hotpluggable you are thwarted anyway. Just do it unconditionally.

IMO, doing it unconditionally is not good because big chunk buffer
is often allocated in probe() path.

Thanks,
--
Ming Lei
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