linux-kernel - Re: [PATCH v2 2/4] dmaengine: Add STM32 DMA driver

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Message-ID: <561E17EA.6000900@linaro.org>
Date:	Wed, 14 Oct 2015 09:52:58 +0100
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	M'boumba Cedric Madianga <cedric.madianga@...il.com>
Cc:	Maxime Coquelin <mcoquelin.stm32@...il.com>, robh+dt@...nel.org,
	pawel.moll@....com, Mark Rutland <mark.rutland@....com>,
	ijc+devicetree@...lion.org.uk, Kumar Gala <galak@...eaurora.org>,
	linux@....linux.org.uk, vinod.koul@...el.com,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v2 2/4] dmaengine: Add STM32 DMA driver

On 14/10/15 08:54, M'boumba Cedric Madianga wrote:
>>> +static int stm32_dma_alloc_chan_resources(struct dma_chan *c)
>>> +{
>>> +       struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
>>> +       struct stm32_dma_device *dmadev = stm32_dma_chan_get_dev(chan);
>>> +       int ret;
>>> +
>>> +       chan->config_init = false;
>>> +       ret = clk_prepare_enable(dmadev->clk);
>>> +       if (ret < 0) {
>>> +               dev_err(chan2dev(chan), "clk_prepare_enable failed: %d\n",
>>> ret);
>>> +               return ret;
>>> +       }
>>> +
>>> +       ret = stm32_dma_disable_chan(chan);
>>> +
>>> +       return ret;
>>> +}
>>
>>
>> The error path here looks like it will leak clock references.
>
> Sorry I didn't catch it. What does it mean ?

If stm32_dma_disable_chan() returns an error then we will not restore 
the original the clock counts causing them to "leak".


Daniel.
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