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

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Date:   Wed, 18 Jan 2017 03:20:23 +0000
From:   "Ashizuka, Yuusuke" <ashiduka@...fujitsu.com>
To:     David Miller <davem@...emloft.net>
CC:     "fugang.duan@....com" <fugang.duan@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] net: fec: Fixed panic problem with non-tso

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Wednesday, January 18, 2017 5:45 AM
> To: Ashizuka, Yuusuke/芦塚 雄介
> Cc: fugang.duan@....com; netdev@...r.kernel.org
> Subject: Re: [PATCH] net: fec: Fixed panic problem with non-tso
> 
> From: Yuusuke Ashiduka <ashiduka@...fujitsu.com>
> Date: Tue, 17 Jan 2017 16:48:20 +0900
> 
> > 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.
> 
> This patch submission is lacking a proper signoff.

Thank you for pointing out my mistake.
I will submit the patch again.