linux-kernel - Re: [PATCH 1/4] dmaengine: ep93xx_dma: Remove unneeded ERROR check before clk

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Date:   Wed, 18 May 2022 09:12:05 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Wan Jiabing <wanjiabing@...o.com>, Vinod Koul <vkoul@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/4] dmaengine: ep93xx_dma: Remove unneeded ERROR check
 before clk_put

On 16/05/2022 10:41, Wan Jiabing wrote:
> clk_put() already uses !clk and IS_ERR(clk) to check ERROR or NULL.
> Remove unneeded ERROR or NULL check for edmac->clk.
> 
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
> ---
>  drivers/dma/ep93xx_dma.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
> index 971ff5f9ae84..60dc7b3f3d0d 100644
> --- a/drivers/dma/ep93xx_dma.c
> +++ b/drivers/dma/ep93xx_dma.c
> @@ -1398,8 +1398,7 @@ static int __init ep93xx_dma_probe(struct platform_device *pdev)
>  	if (unlikely(ret)) {
>  		for (i = 0; i < edma->num_channels; i++) {
>  			struct ep93xx_dma_chan *edmac = &edma->channels[i];
> -			if (!IS_ERR_OR_NULL(edmac->clk))
> -				clk_put(edmac->clk);
> +			clk_put(edmac->clk);

clk_put() which calls __clk_put() seems to print warning on IS_ERR, so
this does not look equivalent code.


Best regards,
Krzysztof