netdev - Re: [PATCH] ravb: do not invalidate cache for RX buffer twice

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Date:	Wed, 15 Jul 2015 15:11:07 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Cc:	linux-sh@...r.kernel.org
Subject: Re: [PATCH] ravb: do not invalidate cache for RX buffer twice

On 7/15/2015 1:45 PM, Sergei Shtylyov wrote:

>> First, dma_sync_single_for_cpu() shouldn't have been called in the first place
>> (it's a streaming DMA API). dma_unmap_single() should have been called instead.
>                            ^
>     Oops, I meant comma here.

>> Second, dma_unmap_single() call after handing the buffer to napi_gro_receive()
>> makes little sense.

>     Moreover, 'desc->dptr' may not be valid at this point...

>> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

>> ---
>> The patch is against Dave Miller's 'net.git' repo.

>> Don't know why I missed this DMA API misuse while working on the driver. :-<

>     Dave, do you want me to resend the patch with fixed up changelog?

    Oops, forgot to CC Dave. :-(

WBR, Sergei

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