netdev - Re: [PATCH v4 4/9] bgmac: simplify rx DMA error handling

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Message-ID: <CACna6rwFcg0AKa=2h7Fg9kNZdtFY8vBNNVwXi67Bvga0v3YU0w@mail.gmail.com>
Date:	Mon, 13 Apr 2015 16:53:46 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	Network Development <netdev@...r.kernel.org>,
	Hauke Mehrtens <hauke@...ke-m.de>
Subject: Re: [PATCH v4 4/9] bgmac: simplify rx DMA error handling

On 13 April 2015 at 15:52, Felix Fietkau <nbd@...nwrt.org> wrote:
> Unmap the DMA buffer before checking it. If it is poisoned, map it again
> and pass it back to the hardware.

Where exactly do you map it again? I can't see it. It's not handled in
bgmac_dma_rx_setup_desc. Also keep in mind that mapping may fail -
this is why old code doesn't unmap anything until a new buffer is
really ready. How do you want to deal with mapping error after
unmapping a buffer?
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