[linux-next:master 6868/7588] sound/soc/fsl/fsl_rpmsg.c:45:45: sparse: sparse: Using plain integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   931294922e65a23e1aad6398b9ae02df74044679
commit: b73d9e6225e86492f6a901223a34ecfa7b55c178 [6868/7588] ASoC: fsl_rpmsg: Add CPU DAI driver for audio base on rpmsg
config: openrisc-randconfig-s031-20210326 (attached as .config)
compiler: or1k-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-277-gc089cd2d-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b73d9e6225e86492f6a901223a34ecfa7b55c178
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout b73d9e6225e86492f6a901223a34ecfa7b55c178
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=openrisc 

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


sparse warnings: (new ones prefixed by >>)

quoted

sound/soc/fsl/fsl_rpmsg.c:45:45: sparse: sparse: Using plain integer as NULL pointer

   sound/soc/fsl/fsl_rpmsg.c:45:56: sparse: sparse: Using plain integer as NULL pointer

vim +45 sound/soc/fsl/fsl_rpmsg.c

    39	
    40	static int fsl_rpmsg_hw_params(struct snd_pcm_substream *substream,
    41				       struct snd_pcm_hw_params *params,
    42				       struct snd_soc_dai *dai)
    43	{
    44		struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
  > 45		struct clk *p = rpmsg->mclk, *pll = 0, *npll = 0;
    46		u64 rate = params_rate(params);
    47		int ret = 0;
    48	
    49		/* Get current pll parent */
    50		while (p && rpmsg->pll8k && rpmsg->pll11k) {
    51			struct clk *pp = clk_get_parent(p);
    52	
    53			if (clk_is_match(pp, rpmsg->pll8k) ||
    54			    clk_is_match(pp, rpmsg->pll11k)) {
    55				pll = pp;
    56				break;
    57			}
    58			p = pp;
    59		}
    60	
    61		/* Switch to another pll parent if needed. */
    62		if (pll) {
    63			npll = (do_div(rate, 8000) ? rpmsg->pll11k : rpmsg->pll8k);
    64			if (!clk_is_match(pll, npll)) {
    65				ret = clk_set_parent(p, npll);
    66				if (ret < 0)
    67					dev_warn(dai->dev, "failed to set parent %s: %d\n",
    68						 __clk_get_name(npll), ret);
    69			}
    70		}
    71	
    72		if (!(rpmsg->mclk_streams & BIT(substream->stream))) {
    73			ret = clk_prepare_enable(rpmsg->mclk);
    74			if (ret) {
    75				dev_err(dai->dev, "failed to enable mclk: %d\n", ret);
    76				return ret;
    77			}
    78	
    79			rpmsg->mclk_streams |= BIT(substream->stream);
    80		}
    81	
    82		return ret;
    83	}
    84	

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