linux-kernel - Re: [PATCH] media: hantro: Avoid global variable for jpeg quantization tables

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Date:   Wed, 17 Nov 2021 07:58:23 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     James Cowgill <james.cowgill@...ize.com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Stuebner <heiko@...ech.de>, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] media: hantro: Avoid global variable for jpeg
 quantization tables

Hi James,

Thanks for the patch.

On Thu, Nov 11, 2021 at 10:01:08PM +0000, James Cowgill wrote:
> On a system with multiple encoders present, it's possible for two
> encoders to write to the global luma and chroma quantization tables at
> the same time if they both submit a JPEG frame to be encoded. Avoid
> this race by moving the tables into the `jpeg_ctx` structure which is
> stored on the stack.
> 
> Signed-off-by: James Cowgill <james.cowgill@...ize.com>

Reviewed-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>