linux-kernel - Re: [PATCH] dma: cppi41: Switch to using managed resource in probe

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Date:	Wed, 24 Sep 2014 11:12:34 +0530
From:	Kiran Padwal <kiran.padwal@...rtplayin.com>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	dan.j.williams@...el.com, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma: cppi41: Switch to using managed resource in probe

On Tuesday 23 September 2014 09:10 PM, Vinod Koul wrote:
> On Tue, Sep 23, 2014 at 06:20:46PM +0530, Kiran Padwal wrote:
>> This change uses managed resource APIs to allocate resources such as,
>> mem, irq in order to simplify the driver unload or failure cases.
>>
>> Signed-off-by: Kiran Padwal <kiran.padwal@...rtplayin.com>
>> ---
>>  drivers/dma/cppi41.c |   15 ++++-----------
>>  1 file changed, 4 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
>> index 5921ce3..d3700fb 100644
>> --- a/drivers/dma/cppi41.c
>> +++ b/drivers/dma/cppi41.c
>> @@ -938,7 +938,7 @@ static int cppi41_dma_probe(struct platform_device *pdev)
>>  	if (!glue_info)
>>  		return -EINVAL;
>>  
>> -	cdd = kzalloc(sizeof(*cdd), GFP_KERNEL);
>> +	cdd = devm_kzalloc(&pdev->dev, sizeof(*cdd), GFP_KERNEL);
>>  	if (!cdd)
>>  		return -ENOMEM;
>>  
>> @@ -959,10 +959,8 @@ static int cppi41_dma_probe(struct platform_device *pdev)
>>  	cdd->qmgr_mem = of_iomap(dev->of_node, 3);
>>  
>>  	if (!cdd->usbss_mem || !cdd->ctrl_mem || !cdd->sched_mem ||
>> -			!cdd->qmgr_mem) {
>> -		ret = -ENXIO;
>> -		goto err_remap;
>> -	}
>> +			!cdd->qmgr_mem)
>> +		return -ENXIO;
>>  
>>  	pm_runtime_enable(dev);
>>  	ret = pm_runtime_get_sync(dev);
>> @@ -989,7 +987,7 @@ static int cppi41_dma_probe(struct platform_device *pdev)
>>  
>>  	cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
>>  
>> -	ret = request_irq(irq, glue_info->isr, IRQF_SHARED,
>> +	ret = devm_request_irq(&pdev->dev, irq, glue_info->isr, IRQF_SHARED,
>>  			dev_name(dev), cdd);
>>  	if (ret)
>>  		goto err_irq;
>> @@ -1009,7 +1007,6 @@ static int cppi41_dma_probe(struct platform_device *pdev)
>>  err_of:
>>  	dma_async_device_unregister(&cdd->ddev);
>>  err_dma_reg:
>> -	free_irq(irq, cdd);
>>  err_irq:
>>  	cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
>>  	cleanup_chans(cdd);
>> @@ -1023,8 +1020,6 @@ err_get_sync:
>>  	iounmap(cdd->ctrl_mem);
>>  	iounmap(cdd->sched_mem);
>>  	iounmap(cdd->qmgr_mem);
>> -err_remap:
>> -	kfree(cdd);
>>  	return ret;
>>  }
>>  
>> @@ -1036,7 +1031,6 @@ static int cppi41_dma_remove(struct platform_device *pdev)
>>  	dma_async_device_unregister(&cdd->ddev);
>>  
>>  	cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
>> -	free_irq(cdd->irq, cdd);
> pls use devm_free_irq() explicitly here, other wise your controller is active and able
> to send interrupts and driver object is getting removed. It is the role of
> driver to quiesce device before releasing
> 

Thanks, I will take care of that and resend the patch.



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