linux-kernel - Re: [PATCH v3 2/6] serial: imx: only set dma_is

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Message-ID: <20170921181503.2d4w7fklptt4cktv@pengutronix.de>
Date:   Thu, 21 Sep 2017 20:15:03 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Martyn Welch <martyn.welch@...labora.co.uk>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nandor Han <nandor.han@...com>,
        Romain Perier <romain.perier@...labora.com>,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Fabio Estevam <fabio.estevam@....com>
Subject: Re: [PATCH v3 2/6] serial: imx: only set dma_is_rxing when DMA starts

On Thu, Sep 21, 2017 at 05:18:13PM +0100, Martyn Welch wrote:
> From: Romain Perier <romain.perier@...labora.com>
> 
> The variable dma_is_rxing is currently set to 1 in imx_disable_rx_int().
> This is problematic as:
> 
> - whilst imx_disable_rx_int() is currently always called before
>   start_rx_dma() this dependency isn't obvious.
> - start_rx_dma() does error checking and might exit without
>   enabling DMA. Currently this will result in dma_is_rxing suggesting
>   that DMA is being used for recieving.
> 
> To avoid these issues, move the setting of dma_is_rxing to
> start_rx_dma() when appropriate.
> 
> Signed-off-by: Romain Perier <romain.perier@...labora.com>
> Signed-off-by: Martyn Welch <martyn.welch@...labora.co.uk>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |