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

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Date: Mon, 15 Jan 2024 08:28:12 +0600
From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
To: Sergey Shtylyov <s.shtylyov@....ru>, "David S. Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: 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

>> +		if (le16_to_cpu(desc->ds_cc) != 0)
> 
>     It's not that != 0 or le16_to_cpu() are necessary here but we're on
> the little-endian platforms anyways...

Let's leave optimizing this out to compiler.

In the code, I'd vote for always having explicit conversion operation when reading __le16 value from memory.

Nikita