From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754796AbeDTMe2 (ORCPT ); Fri, 20 Apr 2018 08:34:28 -0400 Received: from mga12.intel.com ([192.55.52.136]:26716 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754752AbeDTMe1 (ORCPT ); Fri, 20 Apr 2018 08:34:27 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,301,1520924400"; d="scan'208";a="218081357" Message-ID: <1524227663.21176.465.camel@linux.intel.com> Subject: Re: sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used uninitialized in this function From: Andy Shevchenko To: kbuild test robot , Pierre-Louis Bossart Cc: kbuild-all@01.org, linux-kernel@vger.kernel.org, Mark Brown Date: Fri, 20 Apr 2018 15:34:23 +0300 In-Reply-To: <201804181935.hpD7xutn%fengguang.wu@intel.com> References: <201804181935.hpD7xutn%fengguang.wu@intel.com> Organization: Intel Finland Oy Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.5-1+b1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2018-04-18 at 19:42 +0800, kbuild test robot wrote: > 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) { > ^ > Looks like semi-false-positive. We should check retval first, then check fw. The API has to return an error in case when fw is not filled correctly. Otherwise it breaks a rule that input parameters are not altered on error path (when they are not about error itself of course). > 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 > :::::: CC: Mark Brown > > --- > 0-DAY kernel test infrastructure Open Source Technology > Center > https://lists.01.org/pipermail/kbuild-all Intel > Corporation -- Andy Shevchenko Intel Finland Oy