netdev - Re: [PATCH] net: sh_eth: fix the rxdesc pointer when rx descriptor empty happens

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Date:	Fri, 22 Jun 2012 21:51:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	g.liakhovetski@....de
Cc:	yoshihiro.shimoda.uh@...esas.com, netdev@...r.kernel.org,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH] net: sh_eth: fix the rxdesc pointer when rx descriptor
 empty happens

From: Guennadi Liakhovetski <g.liakhovetski@....de>
Date: Fri, 22 Jun 2012 16:16:38 +0200 (CEST)

> Hi Shimoda-san
> 
> On Thu, 21 Jun 2012, Shimoda, Yoshihiro wrote:
> 
>> Hello Guennadi-san,
>> 
>> 2012/06/20 22:10, Guennadi Liakhovetski wrote:
>> > Hello Shimoda-san
>> > 
>> > On Tue, 29 May 2012, Shimoda, Yoshihiro wrote:
>> > 
>> >> When Receive Descriptor Empty happens, rxdesc pointer of the driver
>> >> and actual next descriptor of the controller may be mismatch.
>> >> This patch fixes it.
>> > 
>> > Unfortunately, this patch breaks networking on ecovec (sh7724). Booting 
>> > with dhcp and NFS-root progresses very slowly with lots of "nfs: server 
>> > not responding / Ok" messages and never completes. Reverting it in current 
>> > Linus' tree fixes the problem.
>> 
>> Thank you very much for the report.
>> The SH7724 doesn't set the RMCR register. So, the EDRRR will be clear after
>> the controller receives a freme every time.
>> So, the "fix the rxdesc pointer" had to check a condition.
>> 
>> I wrote a patch for the issue as the following.
>> If possible, would you try the patch?
> 
> Yes, it does seem to fix the problem.
> 
> Tested-by: Guennadi Liakhovetski <g.liakhovetski@....de>

Applied, thanks.
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