linux-kernel - Re: [PATCH] dmaengine: stm32-mdma: call pm_runtime_put if pm_runtime_get

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Date:   Wed, 24 Jun 2020 13:16:13 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        dmaengine@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        emamd001@....edu, wu000273@....edu, kjlu@....edu, smccaman@....edu
Subject: Re: [PATCH] dmaengine: stm32-mdma: call pm_runtime_put if
 pm_runtime_get_sync fails

On 03-06-20, 13:28, Navid Emamdoost wrote:
> Calling pm_runtime_get_sync increments the counter even in case of
> failure, causing incorrect ref count. Call pm_runtime_put if
> pm_runtime_get_sync fails.
> 
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  drivers/dma/stm32-mdma.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
> index 5469563703d1..79bee1bb73f6 100644
> --- a/drivers/dma/stm32-mdma.c
> +++ b/drivers/dma/stm32-mdma.c
> @@ -1449,8 +1449,10 @@ static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
>  	}
>  
>  	ret = pm_runtime_get_sync(dmadev->ddev.dev);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		pm_runtime_put(dmadev->ddev.dev);
>  		return ret;
> +	}
>  
>  	ret = stm32_mdma_disable_chan(chan);
>  	if (ret < 0)
> @@ -1718,8 +1720,10 @@ static int stm32_mdma_pm_suspend(struct device *dev)
>  	int ret;
>  
>  	ret = pm_runtime_get_sync(dev);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		pm_runtime_put_sync(dev);

Not put_sync()...

>  		return ret;
> +	}
>  
>  	for (id = 0; id < dmadev->nr_channels; id++) {
>  		ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
> -- 
> 2.17.1

-- 
~Vinod