[freescale-fslc:6.6-2.0.x-imx 156/16788] sound/soc/fsl/fsl_asrc_m2m.c:353:5: warning: no previous prototype for 'fsl_asrc_process_buffer_pre'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/Freescale/linux-fslc 6.6-2.0.x-imx
head:   ac32ba5fe66266329914d2020570364afe217bec
commit: b88e99c737817b3a29441a12515a0b568094044f [156/16788] MLK-11398: ASoC: fsl_asrc: Add Memory to Memory support
config: xtensa-allyesconfig (https://download.01.org/0day-ci/archive/20240928/202409282200.4bbhjkac-lkp@intel.com/config)
compiler: xtensa-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240928/202409282200.4bbhjkac-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409282200.4bbhjkac-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from sound/soc/fsl/fsl_asrc.c:973:
>> sound/soc/fsl/fsl_asrc_m2m.c:353:5: warning: no previous prototype for 'fsl_asrc_process_buffer_pre' [-Wmissing-prototypes]
     353 | int fsl_asrc_process_buffer_pre(struct completion *complete,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> sound/soc/fsl/fsl_asrc_m2m.c:375:5: warning: no previous prototype for 'fsl_asrc_process_buffer' [-Wmissing-prototypes]
     375 | int fsl_asrc_process_buffer(struct fsl_asrc_pair *pair,
         |     ^~~~~~~~~~~~~~~~~~~~~~~
   sound/soc/fsl/fsl_asrc_m2m.c: In function 'fsl_asrc_calc_last_period_size':
   sound/soc/fsl/fsl_asrc_m2m.c:673:22: warning: variable 'out_length' set but not used [-Wunused-but-set-variable]
     673 |         unsigned int out_length;
         |                      ^~~~~~~~~~
   sound/soc/fsl/fsl_asrc_m2m.c: In function 'fsl_asrc_m2m_resume':
   sound/soc/fsl/fsl_asrc_m2m.c:1040:30: warning: variable 'm2m' set but not used [-Wunused-but-set-variable]
    1040 |         struct fsl_asrc_m2m *m2m;
         |                              ^~~


vim +/fsl_asrc_process_buffer_pre +353 sound/soc/fsl/fsl_asrc_m2m.c

   352	
 > 353	int fsl_asrc_process_buffer_pre(struct completion *complete,
   354					enum asrc_pair_index index, bool dir)
   355	{
   356		if (!wait_for_completion_interruptible_timeout(complete, 10 * HZ)) {
   357			pr_err("%sput DMA task timeout\n", DIR_STR(dir));
   358			return -ETIME;
   359		} else if (signal_pending(current)) {
   360			pr_err("%sput task forcibly aborted\n", DIR_STR(dir));
   361			return -ERESTARTSYS;
   362		}
   363	
   364		return 0;
   365	}
   366	
   367	#define mxc_asrc_dma_umap(dev, m2m) \
   368		do { \
   369			dma_unmap_sg(dev, m2m->sg[IN], m2m->sg_nodes[IN], \
   370				     DMA_TO_DEVICE); \
   371			dma_unmap_sg(dev, m2m->sg[OUT], m2m->sg_nodes[OUT], \
   372				     DMA_FROM_DEVICE); \
   373		} while (0)
   374	
 > 375	int fsl_asrc_process_buffer(struct fsl_asrc_pair *pair,
   376				    struct asrc_convert_buffer *pbuf)
   377	{
   378		struct fsl_asrc *asrc = pair->asrc;
   379		struct fsl_asrc_m2m *m2m = pair->private_m2m;
   380		enum asrc_pair_index index = pair->index;
   381		unsigned long lock_flags;
   382		int ret;
   383	
   384		/* Check input task first */
   385		ret = fsl_asrc_process_buffer_pre(&m2m->complete[IN], index, IN);
   386		if (ret) {
   387			mxc_asrc_dma_umap(&asrc->pdev->dev, m2m);
   388			return ret;
   389		}
   390	
   391		/* ...then output task*/
   392		ret = fsl_asrc_process_buffer_pre(&m2m->complete[OUT], index, OUT);
   393		if (ret) {
   394			mxc_asrc_dma_umap(&asrc->pdev->dev, m2m);
   395			return ret;
   396		}
   397	
   398		mxc_asrc_dma_umap(&asrc->pdev->dev, m2m);
   399	
   400		/* Fetch the remaining data */
   401		spin_lock_irqsave(&m2m->lock, lock_flags);
   402		if (!m2m->pair_hold) {
   403			spin_unlock_irqrestore(&m2m->lock, lock_flags);
   404			return -EFAULT;
   405		}
   406		spin_unlock_irqrestore(&m2m->lock, lock_flags);
   407	
   408		fsl_asrc_read_last_FIFO(pair);
   409	
   410		/* Update final lengths after getting last FIFO */
   411		pbuf->input_buffer_length = m2m->dma_block[IN].length;
   412		pbuf->output_buffer_length = m2m->dma_block[OUT].length;
   413	
   414		if (copy_to_user((void __user *)pbuf->output_buffer_vaddr,
   415				 m2m->dma_block[OUT].dma_vaddr,
   416				 m2m->dma_block[OUT].length))
   417			return -EFAULT;
   418	
   419		return 0;
   420	}
   421	

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