linux-kernel - Re: [Linux-stm32] [PATCH] dmaengine: stm32-dmamux: Fix PM disable depth imbalance in stm32_dmamux

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Date:   Mon, 10 Jan 2022 17:11:00 +0100
From:   Amelie DELAUNAY <amelie.delaunay@...s.st.com>
To:     Miaoqian Lin <linmq006@...il.com>
CC:     Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        <linux-kernel@...r.kernel.org>, Vinod Koul <vkoul@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        <dmaengine@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Linux-stm32] [PATCH] dmaengine: stm32-dmamux: Fix PM disable
 depth imbalance in stm32_dmamux_probe

On 1/8/22 9:53 AM, Miaoqian Lin wrote:
> The pm_runtime_enable will increase power disable depth.
> If the probe fails, we should use pm_runtime_disable() to balance
> pm_runtime_enable().
> 
> Fixes: 4f3ceca254e0 ("dmaengine: stm32-dmamux: Add PM Runtime support")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Thanks for your patch,

Reviewed-by: Amelie Delaunay <amelie.delaunay@...s.st.com>

> ---
>   drivers/dma/stm32-dmamux.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
> index a42164389ebc..d5d55732adba 100644
> --- a/drivers/dma/stm32-dmamux.c
> +++ b/drivers/dma/stm32-dmamux.c
> @@ -292,10 +292,12 @@ static int stm32_dmamux_probe(struct platform_device *pdev)
>   	ret = of_dma_router_register(node, stm32_dmamux_route_allocate,
>   				     &stm32_dmamux->dmarouter);
>   	if (ret)
> -		goto err_clk;
> +		goto pm_disable;
>   
>   	return 0;
>   
> +pm_disable:
> +	pm_runtime_disable(&pdev->dev);
>   err_clk:
>   	clk_disable_unprepare(stm32_dmamux->clk);
>   
>