[ti:ti-linux-5.4.y 2795/9671] drivers/pci/endpoint/pci-epf-core.c:133 pci_epf_add_vepf() warn: inconsistent returns 'epf_pf->lock'.

[kernel test robot <lkp@intel.com>]

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CC: kbuild-all(a)lists.01.org
TO: Kishon Vijay Abraham I <kishon@ti.com>
CC: Sekhar Nori <nsekhar@ti.com>

tree:   git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-linux-5.4.y
head:   5fd9bb3f78d32f23d809e9c2a689925c7bd774f9
commit: 46241066755af938ddbf829f86ae15b2eebaa3f5 [2795/9671] PCI: endpoint: Add support to add virtual function in endpoint core
:::::: branch date: 14 hours ago
:::::: commit date: 8 months ago
config: x86_64-randconfig-m001-20200913 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/pci/endpoint/pci-epf-core.c:133 pci_epf_add_vepf() warn: inconsistent returns 'epf_pf->lock'.

git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git
git fetch --no-tags ti ti-linux-5.4.y
git checkout 46241066755af938ddbf829f86ae15b2eebaa3f5
vim +133 drivers/pci/endpoint/pci-epf-core.c

5e8cb4033807e39 Kishon Vijay Abraham I 2017-04-10   97  
46241066755af93 Kishon Vijay Abraham I 2020-01-23   98  /**
46241066755af93 Kishon Vijay Abraham I 2020-01-23   99   * pci_epf_add_vepf() - associate virtual EP function to physical EP function
46241066755af93 Kishon Vijay Abraham I 2020-01-23  100   * @epf_pf: the physical EP function to which the virtual EP function should be
46241066755af93 Kishon Vijay Abraham I 2020-01-23  101   *   associated
46241066755af93 Kishon Vijay Abraham I 2020-01-23  102   * @epf_vf: the virtual EP function to be added
46241066755af93 Kishon Vijay Abraham I 2020-01-23  103   *
46241066755af93 Kishon Vijay Abraham I 2020-01-23  104   * A physical endpoint function can be associated with multiple virtual
46241066755af93 Kishon Vijay Abraham I 2020-01-23  105   * endpoint functions. Invoke pci_epf_add_epf() to add a virtual PCI endpoint
46241066755af93 Kishon Vijay Abraham I 2020-01-23  106   * function to a physical PCI endpoint function.
46241066755af93 Kishon Vijay Abraham I 2020-01-23  107   */
46241066755af93 Kishon Vijay Abraham I 2020-01-23  108  int pci_epf_add_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf)
46241066755af93 Kishon Vijay Abraham I 2020-01-23  109  {
46241066755af93 Kishon Vijay Abraham I 2020-01-23  110  	u32 vfunc_no;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  111  
46241066755af93 Kishon Vijay Abraham I 2020-01-23  112  	if (IS_ERR_OR_NULL(epf_pf) || IS_ERR_OR_NULL(epf_vf))
46241066755af93 Kishon Vijay Abraham I 2020-01-23  113  		return -EINVAL;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  114  
46241066755af93 Kishon Vijay Abraham I 2020-01-23  115  	if (epf_pf->epc || epf_vf->epc || epf_vf->epf_pf)
46241066755af93 Kishon Vijay Abraham I 2020-01-23  116  		return -EBUSY;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  117  
46241066755af93 Kishon Vijay Abraham I 2020-01-23  118  	mutex_lock(&epf_pf->lock);
46241066755af93 Kishon Vijay Abraham I 2020-01-23  119  	vfunc_no = find_first_zero_bit(&epf_pf->vfunction_num_map,
46241066755af93 Kishon Vijay Abraham I 2020-01-23  120  				       BITS_PER_LONG);
46241066755af93 Kishon Vijay Abraham I 2020-01-23  121  	if (vfunc_no >= BITS_PER_LONG)
46241066755af93 Kishon Vijay Abraham I 2020-01-23  122  		return -EINVAL;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  123  
46241066755af93 Kishon Vijay Abraham I 2020-01-23  124  	set_bit(vfunc_no, &epf_pf->vfunction_num_map);
46241066755af93 Kishon Vijay Abraham I 2020-01-23  125  	epf_vf->vfunc_no = vfunc_no;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  126  
46241066755af93 Kishon Vijay Abraham I 2020-01-23  127  	epf_vf->epf_pf = epf_pf;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  128  	epf_vf->is_vf = true;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  129  
46241066755af93 Kishon Vijay Abraham I 2020-01-23  130  	list_add_tail(&epf_vf->list, &epf_pf->pci_vepf);
46241066755af93 Kishon Vijay Abraham I 2020-01-23  131  	mutex_unlock(&epf_pf->lock);
46241066755af93 Kishon Vijay Abraham I 2020-01-23  132  
46241066755af93 Kishon Vijay Abraham I 2020-01-23 @133  	return 0;
46241066755af93 Kishon Vijay Abraham I 2020-01-23  134  }
46241066755af93 Kishon Vijay Abraham I 2020-01-23  135  EXPORT_SYMBOL_GPL(pci_epf_add_vepf);
46241066755af93 Kishon Vijay Abraham I 2020-01-23  136  

---
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