Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...

[pandora-kernel.git] / drivers / dma / dmaengine.c

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 97b329e..dc003a3 100644 (file)
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -169,12 +169,18 @@ static void dma_client_chan_alloc(struct dma_client *client)
        enum dma_state_client ack;
 
        /* Find a channel */
-       list_for_each_entry(device, &dma_device_list, global_node)
+       list_for_each_entry(device, &dma_device_list, global_node) {
+               /* Does the client require a specific DMA controller? */
+               if (client->slave && client->slave->dma_dev
+                               && client->slave->dma_dev != device->dev)
+                       continue;
+
                list_for_each_entry(chan, &device->channels, device_node) {
                        if (!dma_chan_satisfies_mask(chan, client->cap_mask))
                                continue;
 
-                       desc = chan->device->device_alloc_chan_resources(chan);
+                       desc = chan->device->device_alloc_chan_resources(
+                                       chan, client);
                        if (desc >= 0) {
                                ack = client->event_callback(client,
                                                chan,
@@ -183,12 +189,14 @@ static void dma_client_chan_alloc(struct dma_client *client)
                                /* we are done once this client rejects
                                 * an available resource
                                 */
-                               if (ack == DMA_ACK)
+                               if (ack == DMA_ACK) {
                                        dma_chan_get(chan);
-                               else if (ack == DMA_NAK)
+                                       chan->client_count++;
+                               } else if (ack == DMA_NAK)
                                        return;
                        }
                }
+       }
 }
 
 enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
@@ -272,8 +280,10 @@ static void dma_clients_notify_removed(struct dma_chan *chan)
                /* client was holding resources for this channel so
                 * free it
                 */
-               if (ack == DMA_ACK)
+               if (ack == DMA_ACK) {
                        dma_chan_put(chan);
+                       chan->client_count--;
+               }
        }
 
        mutex_unlock(&dma_list_mutex);
@@ -285,6 +295,10 @@ static void dma_clients_notify_removed(struct dma_chan *chan)
  */
 void dma_async_client_register(struct dma_client *client)
 {
+       /* validate client data */
+       BUG_ON(dma_has_cap(DMA_SLAVE, client->cap_mask) &&
+               !client->slave);
+
        mutex_lock(&dma_list_mutex);
        list_add_tail(&client->global_node, &dma_client_list);
        mutex_unlock(&dma_list_mutex);
@@ -313,8 +327,10 @@ void dma_async_client_unregister(struct dma_client *client)
                        ack = client->event_callback(client, chan,
                                DMA_RESOURCE_REMOVED);
 
-                       if (ack == DMA_ACK)
+                       if (ack == DMA_ACK) {
                                dma_chan_put(chan);
+                               chan->client_count--;
+                       }
                }
 
        list_del(&client->global_node);
@@ -359,6 +375,10 @@ int dma_async_device_register(struct dma_device *device)
                !device->device_prep_dma_memset);
        BUG_ON(dma_has_cap(DMA_INTERRUPT, device->cap_mask) &&
                !device->device_prep_dma_interrupt);
+       BUG_ON(dma_has_cap(DMA_SLAVE, device->cap_mask) &&
+               !device->device_prep_slave_sg);
+       BUG_ON(dma_has_cap(DMA_SLAVE, device->cap_mask) &&
+               !device->device_terminate_all);
 
        BUG_ON(!device->device_alloc_chan_resources);
        BUG_ON(!device->device_free_chan_resources);
@@ -378,7 +398,7 @@ int dma_async_device_register(struct dma_device *device)
 
                chan->chan_id = chancnt++;
                chan->dev.class = &dma_devclass;
-               chan->dev.parent = NULL;
+               chan->dev.parent = device->dev;
                snprintf(chan->dev.bus_id, BUS_ID_SIZE, "dma%dchan%d",
                         device->dev_id, chan->chan_id);
 
@@ -394,6 +414,7 @@ int dma_async_device_register(struct dma_device *device)
                kref_get(&device->refcount);
                kref_get(&device->refcount);
                kref_init(&chan->refcount);
+               chan->client_count = 0;
                chan->slow_ref = 0;
                INIT_RCU_HEAD(&chan->rcu);
        }