On 25-07-18, 13:46, Huang Shijie wrote:
> This patch adds the dmam_async_device_register for DMA code.
> Use the Devres to call the release for the DMA engine driver.
no users?
>
> Signed-off-by: Huang Shijie <sjhuang@xxxxxxxxxxx>
> ---
> Documentation/driver-model/devres.txt | 1 +
> drivers/dma/dmaengine.c | 35 +++++++++++++++++++++++++++
> include/linux/dmaengine.h | 1 +
> 3 files changed, 37 insertions(+)
>
> diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
> index a3e8bceb5f19..26c6de621446 100644
> --- a/Documentation/driver-model/devres.txt
> +++ b/Documentation/driver-model/devres.txt
> @@ -240,6 +240,7 @@ CLOCK
> devm_of_clk_add_hw_provider()
>
> DMA
> + dmam_async_device_register()
can we name it dmaengine_async_device_register, not to confuse with dma APIs
> dmam_alloc_coherent()
> dmam_alloc_attrs()
> dmam_declare_coherent_memory()
> diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
> index 84ac38dbdb65..2477af0bdfc7 100644
> --- a/drivers/dma/dmaengine.c
> +++ b/drivers/dma/dmaengine.c
> @@ -1135,6 +1135,41 @@ void dma_async_device_unregister(struct dma_device *device)
> }
> EXPORT_SYMBOL(dma_async_device_unregister);
>
> +static void dmam_device_release(struct device *dev, void *res)
> +{
> + struct dma_device *device;
> +
> + device = *(struct dma_device **)res;
> + dma_async_device_unregister(device);
> +}
> +
> +/**
> + * dmam_async_device_register - registers DMA devices found
> + * @device: &dma_device
> + *
> + * The operation is managed and will be undone on driver detach.
> + */
> +int dmam_async_device_register(struct dma_device *device)
> +{
> + void *p;
> + int ret;
> +
> + p = devres_alloc(dmam_device_release, sizeof(void *), GFP_KERNEL);
> + if (!p)
> + return -ENOMEM;
> +
> + ret = dma_async_device_register(device);
> + if (!ret) {
> + *(struct dma_device **)p = device;
> + devres_add(device->dev, p);
> + } else {
> + devres_free(p);
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(dmam_async_device_register);
> +
> struct dmaengine_unmap_pool {
> struct kmem_cache *cache;
> const char *name;
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index c8c3a7a93802..b98bced0b98e 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -1406,6 +1406,7 @@ static inline int dmaengine_desc_free(struct dma_async_tx_descriptor *desc)
> /* --- DMA device --- */
>
> int dma_async_device_register(struct dma_device *device);
> +int dmam_async_device_register(struct dma_device *device);
> void dma_async_device_unregister(struct dma_device *device);
> void dma_run_dependencies(struct dma_async_tx_descriptor *tx);
> struct dma_chan *dma_get_slave_channel(struct dma_chan *chan);
> --
> 2.17.1
--
~Vinod
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