linux-kernel - Re: [PATCH] ALSA: hda: Clear RIRB status before reading WP

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Date:   Thu, 06 Feb 2020 11:47:46 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Viswanath L <viswanathl@...dia.com>
Cc:     <perex@...ex.cz>, <tiwai@...e.com>, <mkumard@...dia.com>,
        <jonathanh@...dia.com>, <arnd@...db.de>,
        <yung-chuan.liao@...ux.intel.com>, <baolin.wang@...aro.org>,
        <kstewart@...uxfoundation.org>, <Julia.Lawall@...ia.fr>,
        <tglx@...utronix.de>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <spujar@...dia.com>,
        <sharadg@...dia.com>, <rlokhande@...dia.com>, <DRAMESH@...dia.com>,
        <atalambedu@...dia.com>
Subject: Re: [PATCH] ALSA: hda: Clear RIRB status before reading WP

On Thu, 06 Feb 2020 11:10:53 +0100,
Viswanath L wrote:
> 
> From: Mohan Kumar <mkumard@...dia.com>
> 
> RIRB interrupt status getting cleared after the write pointer is read
> causes a race condition, where last response(s) into RIRB may remain
> unserviced by IRQ, eventually causing azx_rirb_get_response to fall
> back to polling mode. Clearing the RIRB interrupt status ahead of
> write pointer access ensures that this condition is avoided.
> 
> Signed-off-by: Mohan Kumar <mkumard@...dia.com>
> Signed-off-by: Viswanath L <viswanathl@...dia.com>

Applied, thanks.


Takashi