netdev - Re: [PATCH v2] net: fec: Fixed panic problem with non-tso

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Date:   Tue, 17 Jan 2017 21:02:18 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Yuusuke Ashiduka <ashiduka@...fujitsu.com>
Cc:     fugang.duan@....com, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: fec: Fixed panic problem with non-tso

On Wed, 2017-01-18 at 13:11 +0900, Yuusuke Ashiduka wrote:
> If highmem and 2GB or more of memory are valid,
> "this_frag-> page.p" indicates the highmem area,
> so the result of page_address() is NULL and panic occurs.
> 
> This commit fixes this by using the skb_frag_dma_map() helper,
> which takes care of mapping the skb fragment properly. Additionally,
> the type of mapping is now tracked, so it can be unmapped using
> dma_unmap_page or dma_unmap_single when appropriate.


I would prefer we fix the root cause, instead of tweaking all legacy
drivers out there :/