linux-kernel - Re: [PATCH] dma: Make the 'mask' parameter of __dma_request

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Message-ID: <5156A45A.3070309@metafoo.de>
Date:	Sat, 30 Mar 2013 09:37:46 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	Dan Williams <djbw@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma: Make the 'mask' parameter of __dma_request_channel
 const

On 03/29/2013 11:47 PM, Vinod Koul wrote:
> On Mon, Mar 25, 2013 at 01:23:52PM +0100, Lars-Peter Clausen wrote:
>> The 'mask' parameter is not modified in __dma_request_channel and really
>> shouldn't be. Make this explicit by making the parameter const.
>>
>> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
> Applied thanks.
> 
> I manually fixed a conflict in dmaengine.h. Did you generate this on -next?

It was on top of your slave-dma/next branch.

- Lars

>> ---
>>  drivers/dma/dmaengine.c   |  9 ++++++---
>>  include/linux/dmaengine.h | 11 ++++++-----
>>  2 files changed, 12 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
>> index b2728d6..d07ef7d 100644
>> --- a/drivers/dma/dmaengine.c
>> +++ b/drivers/dma/dmaengine.c
>> @@ -174,7 +174,8 @@ static struct class dma_devclass = {
>>  #define dma_device_satisfies_mask(device, mask) \
>>  	__dma_device_satisfies_mask((device), &(mask))
>>  static int
>> -__dma_device_satisfies_mask(struct dma_device *device, dma_cap_mask_t *want)
>> +__dma_device_satisfies_mask(struct dma_device *device,
>> +			    const dma_cap_mask_t *want)
>>  {
>>  	dma_cap_mask_t has;
>>  
>> @@ -463,7 +464,8 @@ static void dma_channel_rebalance(void)
>>  		}
>>  }
>>  
>> -static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_device *dev,
>> +static struct dma_chan *private_candidate(const dma_cap_mask_t *mask,
>> +					  struct dma_device *dev,
>>  					  dma_filter_fn fn, void *fn_param)
>>  {
>>  	struct dma_chan *chan;
>> @@ -505,7 +507,8 @@ static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_devic
>>   * @fn: optional callback to disposition available channels
>>   * @fn_param: opaque parameter to pass to dma_filter_fn
>>   */
>> -struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, void *fn_param)
>> +struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
>> +				       dma_filter_fn fn, void *fn_param)
>>  {
>>  	struct dma_device *device, *_d;
>>  	struct dma_chan *chan = NULL;
>> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
>> index 91ac8da..2511742 100644
>> --- a/include/linux/dmaengine.h
>> +++ b/include/linux/dmaengine.h
>> @@ -967,8 +967,9 @@ 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);
>>  struct dma_chan *dma_request_slave_channel(struct device *dev, char *name);
>> +struct dma_chan *__dma_request_channel(const 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)
>> @@ -978,7 +979,7 @@ static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descript
>>  static inline void dma_issue_pending_all(void)
>>  {
>>  }
>> -static inline struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask,
>> +static inline struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
>>  					      dma_filter_fn fn, void *fn_param)
>>  {
>>  	return NULL;
>> @@ -1005,9 +1006,9 @@ struct dma_chan *net_dma_find_channel(void);
>>  	__dma_request_slave_channel_compat(&(mask), x, y, dev, name)
>>  
>>  static inline struct dma_chan
>> -*__dma_request_slave_channel_compat(dma_cap_mask_t *mask, dma_filter_fn fn,
>> -				  void *fn_param, struct device *dev,
>> -				  char *name)
>> +*__dma_request_slave_channel_compat(const dma_cap_mask_t *mask,
>> +				  dma_filter_fn fn, void *fn_param,
>> +				  struct device *dev, char *name)
>>  {
>>  	struct dma_chan *chan;
>>  
>> -- 
>> 1.8.0
>>

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