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dmaengine: provide dummy functions for DMA_ENGINE=n 

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

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Guennadi Liakhovetski 2010-12-22 14:46:46 +01:00 committed by Dan Williams
parent 8333f65ef0
commit 8f33d5277f
1 changed files with 10 additions and 3 deletions
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13
include/linux/dmaengine.h
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@ -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 --- */