linux-kernel - Re: [PATCH 2/4] dmaengine: sprd-dma: Remove unneeded ERROR check before clk_disable

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Date:   Wed, 18 May 2022 10:44:05 +0800
From:   Jiabing Wan <wanjiabing@...o.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 2/4] dmaengine: sprd-dma: Remove unneeded ERROR check
 before clk_disable_unprepare

Hi,

On 2022/5/17 23:13, Krzysztof Kozlowski wrote:
> On 16/05/2022 10:41, Wan Jiabing wrote:
>> clk_disable_unprepare() already checks ERROR by using IS_ERR_OR_NULL.
> Hmm, maybe I am looking at different sources, but which commit
> introduced IS_ERR_OR_NULL() check? Where is it in the sources?
>
In commit 4dff95dc9477a, IS_ERR_OR_NULL check is added in clk_disable() 
and clk_unprepare().
And clk_disable_unprepare() just calls clk_disable() and clk_unprepare():

static inline void clk_disable_unprepare(struct clk *clk)
{
      clk_disable(clk);
      clk_unprepare(clk);
}
>
> Best regards,
> Krzysztof

Thanks,
Wan Jiabing