[intel-lts:5.4/preempt-rt 9719/19040] drivers/crypto/keembay/keembay-ocs-hcu-core.c:218:31: sparse: sparse: Using plain integer as NULL pointer

[intel-lts:5.4/preempt-rt 9719/19040] drivers/crypto/keembay/keembay-ocs-hcu-core.c:218:31: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot]

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tree:   https://github.com/intel/linux-intel-lts.git 5.4/preempt-rt
head:   36a2ba81b7c7178b0612363a1af6f22887905cc6
commit: 9b07a958f2eb496c88faf0bd749eb600357f4190 [9719/19040] crypto: keembay: Add Keem Bay OCS HCU
config: x86_64-randconfig-s021-20211001 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/intel/linux-intel-lts/commit/9b07a958f2eb496c88faf0bd749eb600357f4190
        git remote add intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-lts 5.4/preempt-rt
        git checkout 9b07a958f2eb496c88faf0bd749eb600357f4190
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/crypto/keembay/

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


sparse warnings: (new ones prefixed by >>)
>> drivers/crypto/keembay/keembay-ocs-hcu-core.c:218:31: sparse: sparse: Using plain integer as NULL pointer
   drivers/crypto/keembay/keembay-ocs-hcu-core.c:219:31: sparse: sparse: Using plain integer as NULL pointer
   drivers/crypto/keembay/keembay-ocs-hcu-core.c:749:31: sparse: sparse: Using plain integer as NULL pointer
   drivers/crypto/keembay/keembay-ocs-hcu-core.c:750:31: sparse: sparse: Using plain integer as NULL pointer

vim +218 drivers/crypto/keembay/keembay-ocs-hcu-core.c

   202	
   203	static void kmb_ocs_free_dma_list(struct ocs_hcu_rctx *rctx)
   204	{
   205		struct ocs_hcu_dev *hcu_dev = rctx->hcu_dev;
   206		struct device *dev = hcu_dev->dev;
   207	
   208		if (!rctx->dma_list_head || !rctx->dma_list_tail)
   209			return;
   210	
   211		if (rctx->sg_dma_nents > 0)
   212			dma_unmap_sg(dev, hcu_dev->req->src, rctx->sg_dma_nents,
   213				     DMA_TO_DEVICE);
   214	
   215		dma_free_coherent(dev, rctx->dma_list_size, rctx->dma_list_head,
   216				  rctx->ll_dma_addr);
   217	
 > 218		rctx->dma_list_head = 0;
   219		rctx->dma_list_tail = 0;
   220		rctx->ll_dma_addr = 0;
   221	}
   222	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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