linux-kernel - Re: [PATCH 01/11] spi: sprd: Release DMA channel also on probe deferral

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Date:   Tue, 8 Sep 2020 15:27:10 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Mark Brown <broonie@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Masahisa Kojima <masahisa.kojima@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-spi@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-tegra@...r.kernel.org, stable <stable@...r.kernel.org>
Subject: Re: [PATCH 01/11] spi: sprd: Release DMA channel also on probe deferral

On Tue, 1 Sep 2020 at 23:27, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> If dma_request_chan() for TX channel fails with EPROBE_DEFER, the RX
> channel would not be released and on next re-probe it would be requested
> second time.
>
> Fixes: 386119bc7be9 ("spi: sprd: spi: sprd: Add DMA mode support")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

Acked-by: Chunyan Zhang <zhang.lyra@...il.com>

Thanks,
Chunyan

> ---
>  drivers/spi/spi-sprd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-sprd.c b/drivers/spi/spi-sprd.c
> index 6678f1cbc566..0443fec3a6ab 100644
> --- a/drivers/spi/spi-sprd.c
> +++ b/drivers/spi/spi-sprd.c
> @@ -563,11 +563,11 @@ static int sprd_spi_dma_request(struct sprd_spi *ss)
>
>         ss->dma.dma_chan[SPRD_SPI_TX]  = dma_request_chan(ss->dev, "tx_chn");
>         if (IS_ERR_OR_NULL(ss->dma.dma_chan[SPRD_SPI_TX])) {
> +               dma_release_channel(ss->dma.dma_chan[SPRD_SPI_RX]);
>                 if (PTR_ERR(ss->dma.dma_chan[SPRD_SPI_TX]) == -EPROBE_DEFER)
>                         return PTR_ERR(ss->dma.dma_chan[SPRD_SPI_TX]);
>
>                 dev_err(ss->dev, "request TX DMA channel failed!\n");
> -               dma_release_channel(ss->dma.dma_chan[SPRD_SPI_RX]);
>                 return PTR_ERR(ss->dma.dma_chan[SPRD_SPI_TX]);
>         }
>
> --
> 2.17.1
>