netdev - Re: [PATCH net-next v13 0/3] add hisilicon hip04 ethernet driver

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Date:	Thu, 15 Jan 2015 10:42:17 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Ding Tianhong <dingtianhong@...wei.com>
Cc:	Alexander Graf <agraf@...e.de>, robh+dt@...nel.org,
	davem@...emloft.net, grant.likely@...aro.org,
	sergei.shtylyov@...entembedded.com,
	linux-arm-kernel@...ts.infradead.org, eric.dumazet@...il.com,
	xuwei5@...ilicon.com, zhangfei.gao@...aro.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux@....linux.org.uk
Subject: Re: [PATCH net-next v13 0/3] add hisilicon hip04 ethernet driver

On Thursday 15 January 2015 16:37:23 Ding Tianhong wrote:
> On 2015/1/14 18:19, Alexander Graf wrote:
> > 
> >>From a 10000 feet perspective it looks like two problems to me
> > 
> >   1) Allocation failure doesn't get handled properly somewhere

This is the bug that Eric pointed out as well.

> >   2) We fail to allocate with order=0 - I don't see why

GFP_ATOMIC. When allocating from a the napi poll function in softirq
context, you have to use nonblocking allocations, which occasionally
fail. This should not cause any harm other than dropped packets.

> is it easy to repetition this bug? how big is your memory on your board,
> is it happened in your previous hip04 driver?

It should be independent of memory size, but may be more likely if you
don't have swap space configured.

	Arnd
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