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>
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 504420f..272bed6 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -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;