linux-kernel - drivers/iommu/amd/iommu.c:2011 init_gcr3_table() warn: missing error code? 'ret'

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Date: Thu, 23 May 2024 18:09:27 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Vasant Hegde <vasant.hegde@....com>
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
	Jason Gunthorpe <jgg@...dia.com>
Subject: drivers/iommu/amd/iommu.c:2011 init_gcr3_table() warn: missing error
 code? 'ret'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   29c73fc794c83505066ee6db893b2a83ac5fac63
commit: c9e8701132e6cc162d082e7dad8a2e9110f5f8fd iommu/amd: Setup GCR3 table in advance if domain is SVA capable
config: x86_64-randconfig-161-20240522 (https://download.01.org/0day-ci/archive/20240522/202405221116.X7cP3GzG-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202405221116.X7cP3GzG-lkp@intel.com/

smatch warnings:
drivers/iommu/amd/iommu.c:2011 init_gcr3_table() warn: missing error code? 'ret'

vim +/ret +2011 drivers/iommu/amd/iommu.c

c9e8701132e6cc Vasant Hegde 2024-04-18  1986  static int init_gcr3_table(struct iommu_dev_data *dev_data,
c9e8701132e6cc Vasant Hegde 2024-04-18  1987  			   struct protection_domain *pdom)
c9e8701132e6cc Vasant Hegde 2024-04-18  1988  {
c9e8701132e6cc Vasant Hegde 2024-04-18  1989  	struct amd_iommu *iommu = get_amd_iommu_from_dev_data(dev_data);
c9e8701132e6cc Vasant Hegde 2024-04-18  1990  	int max_pasids = dev_data->max_pasids;
c9e8701132e6cc Vasant Hegde 2024-04-18  1991  	int ret = 0;
c9e8701132e6cc Vasant Hegde 2024-04-18  1992  
c9e8701132e6cc Vasant Hegde 2024-04-18  1993  	 /*
c9e8701132e6cc Vasant Hegde 2024-04-18  1994  	  * If domain is in pt mode then setup GCR3 table only if device
c9e8701132e6cc Vasant Hegde 2024-04-18  1995  	  * is PASID capable
c9e8701132e6cc Vasant Hegde 2024-04-18  1996  	  */
c9e8701132e6cc Vasant Hegde 2024-04-18  1997  	if (pdom_is_in_pt_mode(pdom) && !pdev_pasid_supported(dev_data))
c9e8701132e6cc Vasant Hegde 2024-04-18  1998  		return ret;
c9e8701132e6cc Vasant Hegde 2024-04-18  1999  
c9e8701132e6cc Vasant Hegde 2024-04-18  2000  	/*
c9e8701132e6cc Vasant Hegde 2024-04-18  2001  	 * By default, setup GCR3 table to support MAX PASIDs
c9e8701132e6cc Vasant Hegde 2024-04-18  2002  	 * supported by the device/IOMMU.
c9e8701132e6cc Vasant Hegde 2024-04-18  2003  	 */
c9e8701132e6cc Vasant Hegde 2024-04-18  2004  	ret = setup_gcr3_table(&dev_data->gcr3_info, iommu,
c9e8701132e6cc Vasant Hegde 2024-04-18  2005  			       max_pasids > 0 ?  max_pasids : 1);
c9e8701132e6cc Vasant Hegde 2024-04-18  2006  	if (ret)
c9e8701132e6cc Vasant Hegde 2024-04-18  2007  		return ret;
c9e8701132e6cc Vasant Hegde 2024-04-18  2008  
c9e8701132e6cc Vasant Hegde 2024-04-18  2009  	/* Setup GCR3[0] only if domain is setup with v2 page table mode */
c9e8701132e6cc Vasant Hegde 2024-04-18  2010  	if (!pdom_is_v2_pgtbl_mode(pdom))
c9e8701132e6cc Vasant Hegde 2024-04-18 @2011  		return ret;

>From the comment, this looks like a false positive, but could you please
change it to "return 0;"

c9e8701132e6cc Vasant Hegde 2024-04-18  2012  
c9e8701132e6cc Vasant Hegde 2024-04-18  2013  	ret = update_gcr3(dev_data, 0, iommu_virt_to_phys(pdom->iop.pgd), true);
c9e8701132e6cc Vasant Hegde 2024-04-18  2014  	if (ret)
c9e8701132e6cc Vasant Hegde 2024-04-18  2015  		free_gcr3_table(&dev_data->gcr3_info);
c9e8701132e6cc Vasant Hegde 2024-04-18  2016  
c9e8701132e6cc Vasant Hegde 2024-04-18  2017  	return ret;
c9e8701132e6cc Vasant Hegde 2024-04-18  2018  }

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