Re: [PATCH v6 2/3] dmaengine: ptdma: register PTDMA controller as a DMA resource

[kernel test robot]

Hi Sanjay,

I love your patch! Perhaps something to improve:

[auto build test WARNING on vkoul-dmaengine/next]
[also build test WARNING on linus/master sparc-next/master v5.9]
[cannot apply to next-20201012]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Sanjay-R-Mehta/Add-support-for-AMD-PTDMA-controller-driver/20201012-192126
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/e3ffc3c5008e1a3bdce62cd71ecbf0cd5ca8de21
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sanjay-R-Mehta/Add-support-for-AMD-PTDMA-controller-driver/20201012-192126
        git checkout e3ffc3c5008e1a3bdce62cd71ecbf0cd5ca8de21
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   drivers/dma/ptdma/ptdma-dmaengine.c: In function 'pt_do_cleanup':
>> drivers/dma/ptdma/ptdma-dmaengine.c:62:22: warning: variable 'chan' set but not used [-Wunused-but-set-variable]
      62 |  struct pt_dma_chan *chan;
         |                      ^~~~
   drivers/dma/ptdma/ptdma-dmaengine.c: In function 'pt_dmaengine_register':
>> drivers/dma/ptdma/ptdma-dmaengine.c:470:19: warning: variable 'dma_chan' set but not used [-Wunused-but-set-variable]
     470 |  struct dma_chan *dma_chan;
         |                   ^~~~~~~~

vim +/chan +62 drivers/dma/ptdma/ptdma-dmaengine.c

    56	
    57	static void pt_do_cleanup(struct virt_dma_desc *vd)
    58	{
    59		struct pt_dma_desc *desc = to_pt_desc(vd);
    60		struct pt_device *pt = desc->pt;
    61		struct dma_chan *dma_chan;
  > 62		struct pt_dma_chan *chan;
    63	
    64		dma_chan = desc->vd.tx.chan;
    65		chan = to_pt_chan(dma_chan);
    66	
    67		pt_free_cmd_resources(pt, &desc->cmdlist);
    68		kmem_cache_free(pt->dma_desc_cache, desc);
    69	}
    70	

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