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dmaengine: add a new helper dmaenginem_async_device_register 

This patch adds the dmaenginem_async_device_register for DMA code.
Use the Devres to call the release for the DMA engine driver.

Signed-off-by: Huang Shijie <sjhuang@iluvatar.ai>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Huang Shijie 2018-07-26 14:45:53 +08:00 committed by Vinod Koul
parent ec8ca8e3b4
commit f39b948dbe
3 changed files with 37 additions and 0 deletions
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1
Documentation/driver-model/devres.txt
View File

@ -240,6 +240,7 @@ CLOCK
devm_of_clk_add_hw_provider()
DMA
dmaenginem_async_device_register()
dmam_alloc_coherent()
dmam_alloc_attrs()
dmam_declare_coherent_memory()

35
drivers/dma/dmaengine.c
View File

@ -1141,6 +1141,41 @@ 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);
}
/**
* dmaenginem_async_device_register - registers DMA devices found
* @device: &dma_device
*
* The operation is managed and will be undone on driver detach.
*/
int dmaenginem_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(dmaenginem_async_device_register);
struct dmaengine_unmap_pool {
struct kmem_cache *cache;
const char *name;

1
include/linux/dmaengine.h
View File

@ -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 dmaenginem_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);