linux-kernel - Re: [PATCH v2] dmaengine: ti: Add missing put_device in ti_dra7_xbar_route

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Message-ID: <a3a99b6a-70c7-5b6b-718f-44c4d957cdda@gmail.com>
Date:   Sat, 4 Jun 2022 23:59:02 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...il.com>
To:     Miaoqian Lin <linmq006@...il.com>, dave.jiang@...el.com,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dmaengine: ti: Add missing put_device in
 ti_dra7_xbar_route_allocate



On 01/06/2022 14:00, Miaoqian Lin wrote:
> of_find_device_by_node() takes reference, we should use put_device()
> to release it when not need anymore.

adding a new label and using goto would be another option or even better?

> Fixes: a074ae38f859 ("dmaengine: Add driver for TI DMA crossbar on DRA7x")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
> changes in v2:
> - split v1 into two patches.
> v1 link:
> https://lore.kernel.org/r/20220512051815.11946-1-linmq006@gmail.com
> ---
>  drivers/dma/ti/dma-crossbar.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/dma/ti/dma-crossbar.c b/drivers/dma/ti/dma-crossbar.c
> index 71d24fc07c00..06da13b18a7b 100644
> --- a/drivers/dma/ti/dma-crossbar.c
> +++ b/drivers/dma/ti/dma-crossbar.c
> @@ -245,6 +245,7 @@ static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec,
>  	if (dma_spec->args[0] >= xbar->xbar_requests) {
>  		dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
>  			dma_spec->args[0]);
> +		put_device(&pdev->dev);
>  		return ERR_PTR(-EINVAL);
>  	}
>  
> @@ -252,12 +253,14 @@ static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec,
>  	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
>  	if (!dma_spec->np) {
>  		dev_err(&pdev->dev, "Can't get DMA master\n");
> +		put_device(&pdev->dev);
>  		return ERR_PTR(-EINVAL);
>  	}
>  
>  	map = kzalloc(sizeof(*map), GFP_KERNEL);
>  	if (!map) {
>  		of_node_put(dma_spec->np);
> +		put_device(&pdev->dev);
>  		return ERR_PTR(-ENOMEM);
>  	}
>  
> @@ -268,6 +271,7 @@ static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec,
>  		mutex_unlock(&xbar->mutex);
>  		dev_err(&pdev->dev, "Run out of free DMA requests\n");
>  		kfree(map);
> +		put_device(&pdev->dev);

this will not apply with the other patch going separately...
Can you send a two patch series?
While there, I would check if labels+goto would look better?

Thanks for finding these and fixing it!

>  		return ERR_PTR(-ENOMEM);
>  	}
>  	set_bit(map->xbar_out, xbar->dma_inuse);

-- 
Péter