dmaengine: replace dma_async_client_register with dmaengine_get

Now that clients no longer need to be notified of channel arrival
dma_async_client_register can simply increment the dmaengine_ref_count.

Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 6 insertions, 16 deletions

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 90aca505a1df..3f1849b7f5ef 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -600,10 +600,9 @@ static void dma_clients_notify_available(void)
 }
 
 /**
- * dma_async_client_register - register a &dma_client
- * @client: ptr to a client structure with valid 'event_callback' and 'cap_mask'
+ * dmaengine_get - register interest in dma_channels
  */
-void dma_async_client_register(struct dma_client *client)
+void dmaengine_get(void)
 {
         struct dma_device *device, *_d;
         struct dma_chan *chan;
@@ -634,25 +633,18 @@ void dma_async_client_register(struct dma_client *client)
          */
         if (dmaengine_ref_count == 1)
                 dma_channel_rebalance();
-        list_add_tail(&client->global_node, &dma_client_list);
         mutex_unlock(&dma_list_mutex);
 }
-EXPORT_SYMBOL(dma_async_client_register);
+EXPORT_SYMBOL(dmaengine_get);
 
 /**
- * dma_async_client_unregister - unregister a client and free the &dma_client
- * @client: &dma_client to free
- *
- * Force frees any allocated DMA channels, frees the &dma_client memory
+ * dmaengine_put - let dma drivers be removed when ref_count == 0
  */
-void dma_async_client_unregister(struct dma_client *client)
+void dmaengine_put(void)
 {
         struct dma_device *device;
         struct dma_chan *chan;
 
-        if (!client)
-                return;
-
         mutex_lock(&dma_list_mutex);
         dmaengine_ref_count--;
         BUG_ON(dmaengine_ref_count < 0);
@@ -663,11 +655,9 @@ void dma_async_client_unregister(struct dma_client *client)
                 list_for_each_entry(chan, &device->channels, device_node)
                         dma_chan_put(chan);
         }
-
-        list_del(&client->global_node);
         mutex_unlock(&dma_list_mutex);
 }
-EXPORT_SYMBOL(dma_async_client_unregister);
+EXPORT_SYMBOL(dmaengine_put);
 
 /**
  * dma_async_client_chan_request - send all available channels to the