Commit 8f33d527 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Dan Williams
Browse files

dmaengine: provide dummy functions for DMA_ENGINE=n 



This lets drivers, optionally using the dmaengine, build with DMA_ENGINE
unselected.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 8333f65e

include/linux/dmaengine.h

+10 −3
Original line number Diff line number Diff line
@@ -824,6 +824,8 @@ enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie); 
#ifdef CONFIG_DMA_ENGINE

enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);

void dma_issue_pending_all(void);

struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, void *fn_param);

void dma_release_channel(struct dma_chan *chan);

#else

static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)

{
@@ -831,7 +833,14 @@ static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descript 
}

static inline void dma_issue_pending_all(void)

{

	do { } while (0);

}

static inline struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask,

					      dma_filter_fn fn, void *fn_param)

{

	return NULL;

}

static inline void dma_release_channel(struct dma_chan *chan)

{

}

#endif
@@ -842,8 +851,6 @@ void dma_async_device_unregister(struct dma_device *device); 
void dma_run_dependencies(struct dma_async_tx_descriptor *tx);

struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type);

#define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y)

struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, void *fn_param);

void dma_release_channel(struct dma_chan *chan);



/* --- Helper iov-locking functions --- */