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

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Date:   Thu, 20 Sep 2018 13:20:10 +0200
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     Yelena Krivosheev <yelena@...vell.com>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "maxime.chevallier@...tlin.com" <maxime.chevallier@...tlin.com>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Stefan Chulski <stefanc@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "mw@...ihalf.com" <mw@...ihalf.com>
Subject: Re: [EXT] [PATCH net] net: mvneta: fix the Rx desc buffer DMA
 unmapping

Hi Yelena,

On Thu, Sep 20, 2018 at 10:14:56AM +0000, Yelena Krivosheev wrote:
> 
> Please, check and fix all cases of dma_unmap_single() usage.
> See mvneta_rxq_drop_pkts()
> ...
> 		if (!data || !(rx_desc->buf_phys_addr))
> 			continue;
> 		dma_unmap_single(pp->dev->dev.parent, rx_desc->buf_phys_addr,
> 				 MVNETA_RX_BUF_SIZE(pp->pkt_size), DMA_FROM_DEVICE);
> 		__free_page(data);
> ...

I had a look at the one reported by CONFIG_DMA_API_DEBUG, and at DMA
unmapping calls using PAGE_SIZE. As you pointed out there might be
others parts, thanks!

Antoine

-- 
Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com