Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-02 09:01:34 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'topic/of' into for-linus

Browse Source
This commit is contained in:
Vinod Koul 2013-08-14 13:55:04 +05:30
commit aab81e47f5
2 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/dma/dmaengine.c
View File

@ -503,6 +503,32 @@ static struct dma_chan *private_candidate(const dma_cap_mask_t *mask,
return NULL;
}
/**
* dma_request_channel - try to get specific channel exclusively
* @chan: target channel
*/
struct dma_chan *dma_get_slave_channel(struct dma_chan *chan)
{
int err = -EBUSY;
/* lock against __dma_request_channel */
mutex_lock(&dma_list_mutex);
if (chan->client_count == 0)
err = dma_chan_get(chan);
else
chan = NULL;
mutex_unlock(&dma_list_mutex);
if (err)
pr_debug("%s: failed to get %s: (%d)\n",
__func__, dma_chan_name(chan), err);
return chan;
}
EXPORT_SYMBOL_GPL(dma_get_slave_channel);
/**
* dma_request_channel - try to allocate an exclusive channel
* @mask: capabilities that the channel must satisfy

1
include/linux/dmaengine.h
View File

@ -995,6 +995,7 @@ int dma_async_device_register(struct dma_device *device);
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);
struct dma_chan *dma_get_slave_channel(struct dma_chan *chan);
struct dma_chan *net_dma_find_channel(void);
#define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y)
#define dma_request_slave_channel_compat(mask, x, y, dev, name) \