summaryrefslogtreecommitdiffstats
path: root/drivers/dma
diff options
context:
space:
mode:
authorHuang Shijie <sjhuang@iluvatar.ai>2018-07-26 14:45:53 +0800
committerVinod Koul <vkoul@kernel.org>2018-07-30 10:50:22 +0530
commitf39b948dbeaf9da0dfd17e68704f38fe4237788f (patch)
tree398e038a9d6dad68808d424deedf6ec13dfefd54 /drivers/dma
parentec8ca8e3b4809bf603814a8834bfd3891e1ccf74 (diff)
downloadlinux-f39b948dbeaf9da0dfd17e68704f38fe4237788f.tar.bz2
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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 504420f213ff..272bed6c8ba7 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;