linux-kernel - Re: [PATCH] ASoC: Use memset

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Message-ID: <20200918110152.GD5703@sirena.org.uk>
Date:   Fri, 18 Sep 2020 12:01:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Shane Chien <shane.chien@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org, wsd_upstream@...iatek.com,
        jiaxin.yu@...iatek.com, eason.yen@...iatek.com
Subject: Re: [PATCH] ASoC: Use memset_io to access I/O memory

On Fri, Sep 18, 2020 at 06:00:19PM +0800, Shane Chien wrote:

>  	/* clear the buffer for avoiding possible kernel info leaks */
>  	if (runtime->dma_area && !substream->ops->copy_user)
> -		memset(runtime->dma_area, 0, runtime->dma_bytes);
> +		memset_io(runtime->dma_area, 0, runtime->dma_bytes);

This is regular RAM that will be accessed by the devices rather than
memory mapped regions provided by devices, the _io variants are normally
for memory mapped regions on devices.

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