linux-kernel - Re: [PATCH net] net: mvneta: fix the Rx desc buffer DMA unmapping

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Date:   Wed, 19 Sep 2018 21:25:41 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     antoine.tenart@...tlin.com
Cc:     yelena@...vell.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
        maxime.chevallier@...tlin.com, gregory.clement@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        ymarkman@...vell.com, mw@...ihalf.com
Subject: Re: [PATCH net] net: mvneta: fix the Rx desc buffer DMA unmapping

From: Antoine Tenart <antoine.tenart@...tlin.com>
Date: Wed, 19 Sep 2018 15:29:06 +0200

> With CONFIG_DMA_API_DEBUG enabled we now get a warning when using the
> mvneta driver:
> 
>   mvneta d0030000.ethernet: DMA-API: device driver frees DMA memory with
>   wrong function [device address=0x000000001165b000] [size=4096 bytes]
>   [mapped as page] [unmapped as single]
> 
> This is because when using the s/w buffer management, the Rx descriptor
> buffer is mapped with dma_map_page but unmapped with dma_unmap_single.
> This patch fixes this by using the right unmapping function.
> 
> Fixes: 562e2f467e71 ("net: mvneta: Improve the buffer allocation method for SWBM")
> Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>

Applied.