This patch adds the dmam_async_device_register for DMA code. Use the Devres to call the release for the DMA engine driver.
Signed-off-by: Huang Shijie <[email protected]> --- 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() 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
