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dmaengine: Mark dma_request_slave_channel() deprecated

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New drivers should use dma_request_chan() instead
dma_request_slave_channel()

dma_request_slave_channel() is a simple wrapper for dma_request_chan()
eating up the error code for channel request failure and makes deferred
probing impossible.

Move the dma_request_slave_channel() into the header as inline function,
mark it as deprecated.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20200828110507.22407-1-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Peter Ujfalusi 2020-08-28 14:05:07 +03:00 committed by Vinod Koul
parent 145fbd1e82
commit 7547dbd3b1
2 changed files with 9 additions and 24 deletions
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18
drivers/dma/dmaengine.c
View File

@ -871,24 +871,6 @@ struct dma_chan *dma_request_chan(struct device *dev, const char *name)
}
EXPORT_SYMBOL_GPL(dma_request_chan);
/**
* dma_request_slave_channel - try to allocate an exclusive slave channel
* @dev: pointer to client device structure
* @name: slave channel name
*
* Returns pointer to appropriate DMA channel on success or NULL.
*/
struct dma_chan *dma_request_slave_channel(struct device *dev,
const char *name)
{
struct dma_chan *ch = dma_request_chan(dev, name);
if (IS_ERR(ch))
return NULL;
return ch;
}
EXPORT_SYMBOL_GPL(dma_request_slave_channel);
/**
* dma_request_chan_by_mask - allocate a channel satisfying certain capabilities
* @mask: capabilities that the channel must satisfy

15
include/linux/dmaengine.h
View File

@ -1472,7 +1472,6 @@ void dma_issue_pending_all(void);
struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
dma_filter_fn fn, void *fn_param,
struct device_node *np);
struct dma_chan *dma_request_slave_channel(struct device *dev, const char *name);
struct dma_chan *dma_request_chan(struct device *dev, const char *name);
struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask);
@ -1502,11 +1501,6 @@ static inline struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
{
return NULL;
}
static inline struct dma_chan *dma_request_slave_channel(struct device *dev,
const char *name)
{
return NULL;
}
static inline struct dma_chan *dma_request_chan(struct device *dev,
const char *name)
{
@ -1575,6 +1569,15 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx);
#define dma_request_channel(mask, x, y) \
__dma_request_channel(&(mask), x, y, NULL)
/* Deprecated, please use dma_request_chan() directly */
static inline struct dma_chan * __deprecated
dma_request_slave_channel(struct device *dev, const char *name)
{
struct dma_chan *ch = dma_request_chan(dev, name);
return IS_ERR(ch) ? NULL : ch;
}
static inline struct dma_chan
*dma_request_slave_channel_compat(const dma_cap_mask_t mask,
dma_filter_fn fn, void *fn_param,