[RFC,v3,7/7] dmaengine: Add Synopsys eDMA IP test and sample driver

[Jose Abreu <Jose.Abreu@synopsys.com>]

Hi Gustavo,

On 1/11/2019 6:33 PM, Gustavo Pimentel wrote:
> Add Synopsys eDMA IP test and sample driver to be use for testing
> purposes and also as a reference for any developer who needs to
> implement and use Synopsys eDMA.
> 
> This driver can be compile as built-in or external module in kernel.
> 
> To enable this driver just select DW_EDMA_TEST option in kernel
> configuration, however it requires and selects automatically DW_EDMA
> option too.
> 
> Changes:
> RFC v1->RFC v2:
>  - No changes
> RFC v2->RFC v3:
>  - Add test module
> 
> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: Vinod Koul <vkoul@kernel.org>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Eugeniy Paltsev <paltsev@synopsys.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Russell King <rmk+kernel@armlinux.org.uk>
> Cc: Niklas Cassel <niklas.cassel@linaro.org>
> Cc: Joao Pinto <jpinto@synopsys.com>
> Cc: Jose Abreu <jose.abreu@synopsys.com>
> Cc: Luis Oliveira <lolivei@synopsys.com>
> Cc: Vitor Soares <vitor.soares@synopsys.com>
> Cc: Nelson Costa <nelson.costa@synopsys.com>
> Cc: Pedro Sousa <pedrom.sousa@synopsys.com>

> +static int dw_edma_test_add_channel(struct dw_edma_test_info *info,
> +				    struct dma_chan *chan,
> +				    u32 channel)
> +{
> +	struct dw_edma_test_params *params = &info->params;
> +	struct dw_edma_test_thread *thread;
> +	struct dw_edma_test_chan *tchan;
> +
> +	tchan = kvmalloc(sizeof(*tchan), GFP_KERNEL);
> +	if (!tchan)
> +		return -ENOMEM;
> +
> +	tchan->chan = chan;
> +
> +	thread = kvzalloc(sizeof(*thread), GFP_KERNEL);
> +	if (!thread) {
> +		kvfree(tchan);
> +		return -ENOMEM;
> +	}
> +
> +	thread->info = info;
> +	thread->chan = tchan->chan;
> +	switch (channel) {
> +	case EDMA_CH_WR:
> +		thread->direction = DMA_DEV_TO_MEM;
> +		break;
> +	case EDMA_CH_RD:
> +		thread->direction = DMA_MEM_TO_DEV;
> +		break;
> +	default:
> +		kvfree(tchan);

You are leaking thread here.

> +		return -EPERM;
> +	}
> +	thread->test_done.wait = &thread->done_wait;
> +	init_waitqueue_head(&thread->done_wait);
> +
> +	if (!params->repetitions)
> +		thread->task = kthread_create(dw_edma_test_sg, thread, "%s",
> +					      dma_chan_name(chan));
> +	else
> +		thread->task = kthread_create(dw_edma_test_cyclic, thread, "%s",
> +					      dma_chan_name(chan));
> +
> +	if (IS_ERR(thread->task)) {
> +		pr_err("failed to create thread %s\n", dma_chan_name(chan));
> +		kvfree(tchan);
> +		kvfree(thread);
> +		return -EPERM;
> +	}
> +
> +	tchan->thread = thread;
> +	dev_dbg(chan->device->dev, "add thread %s\n", dma_chan_name(chan));
> +	list_add_tail(&tchan->node, &info->channels);
> +
> +	return 0;
> +}
> +