linux-kernel - sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used uninitialized in this function

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Date:   Wed, 18 Apr 2018 19:42:38 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used
 uninitialized in this function

Hi Pierre-Louis,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a27fc14219f2e3c4a46ba9177b04d9b52c875532
commit: 4772c16ede522d46219a59646503d2020841a6f4 ASoC: Intel: Kconfig: Simplify-clarify ACPI/PCI dependencies
date:   3 months ago
config: i386-randconfig-b0-04181911 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 4772c16ede522d46219a59646503d2020841a6f4
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   sound/soc/intel/atom/sst/sst_loader.c: In function 'sst_request_fw':
>> sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used uninitialized in this function [-Wuninitialized]
     if (fw == NULL) {
            ^

vim +/fw +357 sound/soc/intel/atom/sst/sst_loader.c

9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  344  
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  345  /*
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  346   * sst_request_fw - requests audio fw from kernel and saves a copy
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  347   *
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  348   * This function requests the SST FW from the kernel, parses it and
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  349   * saves a copy in the driver context
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  350   */
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  351  static int sst_request_fw(struct intel_sst_drv *sst)
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  352  {
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  353  	int retval = 0;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  354  	const struct firmware *fw;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  355  
5794b7ec sound/soc/intel/sst/sst_loader.c Fang, Yang A 2014-10-30  356  	retval = request_firmware(&fw, sst->firmware_name, sst->dev);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16 @357  	if (fw == NULL) {
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  358  		dev_err(sst->dev, "fw is returning as null\n");
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  359  		return -EINVAL;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  360  	}
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  361  	if (retval) {
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  362  		dev_err(sst->dev, "request fw failed %d\n", retval);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  363  		return retval;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  364  	}
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  365  	mutex_lock(&sst->sst_lock);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  366  	retval = sst_cache_and_parse_fw(sst, fw);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  367  	mutex_unlock(&sst->sst_lock);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  368  
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  369  	return retval;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  370  }
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  371  

:::::: The code at line 357 was first introduced by commit
:::::: 9012c9544eeac485b2193fea721233907f0847fa ASoC: Intel: mrfld - Add DSP load and management

:::::: TO: Vinod Koul <vinod.koul@...el.com>
:::::: CC: Mark Brown <broonie@...nel.org>

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