linux-kernel - Re: [PATCH v2 1/5] ASoC: sh: rz-ssi: Drop calling rz_ssi_pio

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Date:   Wed, 19 Jan 2022 14:35:24 +0100
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Biju Das <biju.das.jz@...renesas.com>
CC:     Pavel Machek <pavel@...x.de>, <linux-renesas-soc@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] ASoC: sh: rz-ssi: Drop calling rz_ssi_pio_recv()
 recursively

On 2022-01-15 2:22 AM, Lad Prabhakar wrote:
> Instead of recursively calling rz_ssi_pio_recv() use a loop instead
> to read the samples from RX fifo.
> 
> Inspiration for this patch is to avoid recursion, as recursion is
> unwelcome in kernel due to limited stack use. Also to add this driver
> will later be used on RZ/A2 SoC's which runs with limited memory.
> 
> This also fixes an issue where the return value of rz_ssi_pio_recv()
> was ignored when called recursively.
> 
> Fixes: 03e786bd4341 ("ASoC: sh: Add RZ/G2L SSIF-2 driver")
> Reported-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> ---
> v1->v2
> * Used a do while loop
> * Fixed comments pointed by Cezary.

Apart from my previous suggestions which have already been addressed, I 
don't see any issues with the patch, so:

Reviewed-by: Cezary Rojewski <cezary.rojewski@...el.com>


Regards,
Czarek