linux-kernel - Re: [PATCH] net: ravb: Fix dma_addr

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Message-ID: <5750a0c0-3ad6-409c-9b76-82c5c015e719@gmail.com>
Date: Sat, 13 Jan 2024 13:03:14 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Nikita Yushchenko <nikita.yoush@...entembedded.com>,
 "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: Sergey Shtylyov <s.shtylyov@....ru>,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ravb: Fix dma_addr_t truncation in error case

On 1/12/2024 8:22 PM, Nikita Yushchenko wrote:
> In ravb_start_xmit(), ravb driver uses u32 variable to store result of
> dma_map_single() call. Since ravb hardware has 32-bit address fields in
> descriptors, this works properly when mapping is successful - it is
> platform's job to provide mapping addresses that fit into hardware
> limitations.
> 
> However, in failure case dma_map_single() returns DMA_MAPPING_ERROR
> constant that is 64-bit when dma_addr_t is 64-bit. Storing this constant
> in u32 leads to truncation, and further call to dma_mapping_error()
> fails to notice the error.
> 
> Fix that by storing result of dma_map_single() in a dma_addr_t
> variable.
> 
> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
> Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>

Nit: since this is a bug fix you should prefix your patches with "[PATCH 
net]", see:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/maintainer-netdev.rst#n62
-- 
Florian