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path: root/drivers/dma/dmaengine.c
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Diffstat (limited to 'drivers/dma/dmaengine.c')
-rw-r--r--drivers/dma/dmaengine.c74
1 files changed, 3 insertions, 71 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 3f1849b7f5ef..9fc91f973a9a 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -31,15 +31,12 @@
*
* LOCKING:
*
- * The subsystem keeps two global lists, dma_device_list and dma_client_list.
- * Both of these are protected by a mutex, dma_list_mutex.
+ * The subsystem keeps a global list of dma_device structs it is protected by a
+ * mutex, dma_list_mutex.
*
* Each device has a channels list, which runs unlocked but is never modified
* once the device is registered, it's just setup by the driver.
*
- * Each client is responsible for keeping track of the channels it uses. See
- * the definition of dma_event_callback in dmaengine.h.
- *
* Each device has a kref, which is initialized to 1 when the device is
* registered. A kref_get is done for each device registered. When the
* device is released, the corresponding kref_put is done in the release
@@ -74,7 +71,6 @@
static DEFINE_MUTEX(dma_list_mutex);
static LIST_HEAD(dma_device_list);
-static LIST_HEAD(dma_client_list);
static long dmaengine_ref_count;
/* --- sysfs implementation --- */
@@ -189,7 +185,7 @@ static int dma_chan_get(struct dma_chan *chan)
/* allocate upon first client reference */
if (chan->client_count == 1 && err == 0) {
- int desc_cnt = chan->device->device_alloc_chan_resources(chan, NULL);
+ int desc_cnt = chan->device->device_alloc_chan_resources(chan);
if (desc_cnt < 0) {
err = desc_cnt;
@@ -218,40 +214,6 @@ static void dma_chan_put(struct dma_chan *chan)
chan->device->device_free_chan_resources(chan);
}
-/**
- * dma_client_chan_alloc - try to allocate channels to a client
- * @client: &dma_client
- *
- * Called with dma_list_mutex held.
- */
-static void dma_client_chan_alloc(struct dma_client *client)
-{
- struct dma_device *device;
- struct dma_chan *chan;
- enum dma_state_client ack;
-
- /* Find a channel */
- list_for_each_entry(device, &dma_device_list, global_node) {
- if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
- continue;
- if (!dma_device_satisfies_mask(device, client->cap_mask))
- continue;
-
- list_for_each_entry(chan, &device->channels, device_node) {
- if (!chan->client_count)
- continue;
- ack = client->event_callback(client, chan,
- DMA_RESOURCE_AVAILABLE);
-
- /* we are done once this client rejects
- * an available resource
- */
- if (ack == DMA_NAK)
- return;
- }
- }
-}
-
enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
{
enum dma_status status;
@@ -585,21 +547,6 @@ void dma_release_channel(struct dma_chan *chan)
EXPORT_SYMBOL_GPL(dma_release_channel);
/**
- * dma_chans_notify_available - broadcast available channels to the clients
- */
-static void dma_clients_notify_available(void)
-{
- struct dma_client *client;
-
- mutex_lock(&dma_list_mutex);
-
- list_for_each_entry(client, &dma_client_list, global_node)
- dma_client_chan_alloc(client);
-
- mutex_unlock(&dma_list_mutex);
-}
-
-/**
* dmaengine_get - register interest in dma_channels
*/
void dmaengine_get(void)
@@ -660,19 +607,6 @@ void dmaengine_put(void)
EXPORT_SYMBOL(dmaengine_put);
/**
- * dma_async_client_chan_request - send all available channels to the
- * client that satisfy the capability mask
- * @client - requester
- */
-void dma_async_client_chan_request(struct dma_client *client)
-{
- mutex_lock(&dma_list_mutex);
- dma_client_chan_alloc(client);
- mutex_unlock(&dma_list_mutex);
-}
-EXPORT_SYMBOL(dma_async_client_chan_request);
-
-/**
* dma_async_device_register - registers DMA devices found
* @device: &dma_device
*/
@@ -765,8 +699,6 @@ int dma_async_device_register(struct dma_device *device)
dma_channel_rebalance();
mutex_unlock(&dma_list_mutex);
- dma_clients_notify_available();
-
return 0;
err_out: