linux-kernel - Re: [PATCH v5 1/4] dmaengine: dw: platform: check nr

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Date:	Thu, 21 Apr 2016 23:26:41 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	kbuild-all@...org, Viresh Kumar <vireshk@...nel.org>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Vineet Gupta <vgupta@...opsys.com>, Tejun Heo <tj@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v5 1/4] dmaengine: dw: platform: check nr_masters to be
 non-zero

Hi,

[auto build test WARNING on next-20160421]
[also build test WARNING on v4.6-rc4]
[cannot apply to robh/for-next asoc/for-next v4.6-rc4 v4.6-rc3 v4.6-rc2]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Andy-Shevchenko/Fixes-cleanups-in-dw_dmac-affects-on-few-subsystems/20160421-231541
config: i386-randconfig-x003-201616 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/dma/dw/platform.c: In function 'dw_probe':
>> drivers/dma/dw/platform.c:119:20: warning: 'pdata' may be used uninitialized in this function [-Wmaybe-uninitialized]
     pdata->nr_masters = nr_masters;
                       ^
   drivers/dma/dw/platform.c:104:31: note: 'pdata' was declared here
     struct dw_dma_platform_data *pdata;
                                  ^

vim +/pdata +119 drivers/dma/dw/platform.c

   103		struct device_node *np = pdev->dev.of_node;
   104		struct dw_dma_platform_data *pdata;
   105		u32 tmp, arr[DW_DMA_MAX_NR_MASTERS];
   106		u32 nr_masters;
   107		u32 nr_channels;
   108	
   109		if (!np) {
   110			dev_err(&pdev->dev, "Missing DT data\n");
   111			return NULL;
   112		}
   113	
   114		if (of_property_read_u32(np, "dma-masters", &nr_masters))
   115			return NULL;
   116		if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
   117			return NULL;
   118	
 > 119		pdata->nr_masters = nr_masters;
   120	
   121		if (of_property_read_u32(np, "dma-channels", &nr_channels))
   122			return NULL;
   123	
   124		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
   125		if (!pdata)
   126			return NULL;
   127	

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0-DAY kernel test infrastructure                Open Source Technology Center
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