linux-kernel - Re: [PATCH] net: ravb: Fix wrong dma_unmap

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Date: Sat, 13 Jan 2024 13:13:45 -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 wrong dma_unmap_single() calls in ring
 unmapping

On 1/12/2024 8:47 PM, Nikita Yushchenko wrote:
> When unmapping ring entries on Rx ring release, ravb driver needs to
> unmap only those entries that have been mapped successfully.
> 
> To check if an entry needs to be unmapped, currently the address stored
> inside descriptor is passed to dma_mapping_error() call. But, address
> field inside descriptor is 32-bit, while dma_mapping_error() is
> implemented by comparing it's argument with DMA_MAPPING_ERROR constant
> that is 64-bit when dma_addr_t is 64-bit. So the comparison gets wrong,
> resulting into ravb driver calling dma_unnmap_single() for 0xffffffff
> address.

I would still spell out explicitly that a failed mapping from 
ravb_rx_ring_format_gbeth() and ravb_rx_ring_format_rcar() results in 
writing the ds_cc descriptor field to 0.

With that fixed and the typo spotted by Sergey, you may add:

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