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

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Message-ID: <CACVXFVNCg4mHcy+-0LGjxLninp1fXYUUnW=EHwor7K3Sh+f9nA@mail.gmail.com>
Date:	Thu, 11 Apr 2013 20:16:31 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Bjørn Mork <bjorn@...k.no>,
	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 7:54 PM, Oliver Neukum <oliver@...kum.org> wrote:
>> > Is this example
>> >  a) wrong, or
>> >  b) not applicable, or
>> >  c) to be excluded from the new API?
>>
>> IMO, it may be a) or b), and we can find many GFP_KERNEL usage
>> inside usbnet(kevent(), ...).
>
> Only in the rx path.

So it is b) since usbnet_status_start() can't be in rx path, :-)

>
>> Also (3) doesn't explain the cause. Oliver, could you give a hit?
>
> IIRC this was to cover networked file systems.

Given atomic allocation is used in rx/tx path already, and suppose
no other contexts might block rx/tx path, so is the rule still valid now?

Thanks,
-- 
Ming Lei
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