Hello Zhu Lingshan, The patch 79333575b8bd: "vDPA/ifcvf: implement shared IRQ feature" from Feb 22, 2022, leads to the following Smatch static checker warning: drivers/vdpa/ifcvf/ifcvf_main.c:306 ifcvf_request_config_irq() error: uninitialized symbol 'config_vector'. drivers/vdpa/ifcvf/ifcvf_main.c 287 static int ifcvf_request_config_irq(struct ifcvf_adapter *adapter) 288 { 289 struct pci_dev *pdev = adapter->pdev; 290 struct ifcvf_hw *vf = &adapter->vf; 291 int config_vector, ret; 292 293 if (vf->msix_vector_status == MSIX_VECTOR_DEV_SHARED) 294 return 0; 295 296 if (vf->msix_vector_status == MSIX_VECTOR_PER_VQ_AND_CONFIG) 297 /* vector 0 ~ vf->nr_vring for vqs, num vf->nr_vring vector for config interrupt */ 298 config_vector = vf->nr_vring; Set here. 299 300 if (vf->msix_vector_status == MSIX_VECTOR_SHARED_VQ_AND_CONFIG) 301 /* vector 0 for vqs and 1 for config interrupt */ 302 config_vector = 1; And here. But no else path. 303 304 snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n", 305 pci_name(pdev)); --> 306 vf->config_irq = pci_irq_vector(pdev, config_vector); 307 ret = devm_request_irq(&pdev->dev, vf->config_irq, 308 ifcvf_config_changed, 0, 309 vf->config_msix_name, vf); 310 if (ret) { 311 IFCVF_ERR(pdev, "Failed to request config irq\n"); 312 goto err; 313 } 314 315 ret = ifcvf_set_config_vector(vf, config_vector); 316 if (ret == VIRTIO_MSI_NO_VECTOR) { 317 IFCVF_ERR(pdev, "No msix vector for device config\n"); 318 goto err; 319 } 320 321 return 0; 322 err: 323 ifcvf_free_irq(adapter); 324 325 return -EFAULT; 326 } regards, dan carpenter _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization