Hello Asutosh Das,
The patch c263b4ef737e: "scsi: ufs: core: mcq: Configure resource
regions" from Jan 13, 2023, leads to the following Smatch static
checker warning:
drivers/ufs/host/ufs-qcom.c:1455 ufs_qcom_mcq_config_resource() warn: passing zero to 'PTR_ERR'
drivers/ufs/host/ufs-qcom.c:1469 ufs_qcom_mcq_config_resource() info: returning a literal zero is cleaner
drivers/ufs/host/ufs-qcom.c
1425 static int ufs_qcom_mcq_config_resource(struct ufs_hba *hba)
1426 {
1427 struct platform_device *pdev = to_platform_device(hba->dev);
1428 struct ufshcd_res_info *res;
1429 struct resource *res_mem, *res_mcq;
1430 int i, ret = 0;
1431
1432 memcpy(hba->res, ufs_res_info, sizeof(ufs_res_info));
1433
1434 for (i = 0; i < RES_MAX; i++) {
1435 res = &hba->res[i];
1436 res->resource = platform_get_resource_byname(pdev,
1437 IORESOURCE_MEM,
1438 res->name);
1439 if (!res->resource) {
1440 dev_info(hba->dev, "Resource %s not provided\n", res->name);
1441 if (i == RES_UFS)
1442 return -ENOMEM;
1443 continue;
1444 } else if (i == RES_UFS) {
1445 res_mem = res->resource;
1446 res->base = hba->mmio_base;
1447 continue;
1448 }
1449
1450 res->base = devm_ioremap_resource(hba->dev, res->resource);
1451 if (IS_ERR(res->base)) {
1452 dev_err(hba->dev, "Failed to map res %s, err=%d\n",
1453 res->name, (int)PTR_ERR(res->base));
1454 res->base = NULL;
^^^^^^^^^^^^^^^^
--> 1455 ret = PTR_ERR(res->base);
^^^^^^^^^^^^^^^^^^^^^^^^
Need to preserve the error code beforse setting this to NULL.
1456 return ret;
1457 }
1458 }
1459
1460 /* MCQ resource provided in DT */
1461 res = &hba->res[RES_MCQ];
1462 /* Bail if MCQ resource is provided */
1463 if (res->base)
1464 goto out;
1465
1466 /* Explicitly allocate MCQ resource from ufs_mem */
1467 res_mcq = devm_kzalloc(hba->dev, sizeof(*res_mcq), GFP_KERNEL);
1468 if (!res_mcq)
1469 return ret;
Return -ENOMEM;
1470
1471 res_mcq->start = res_mem->start +
1472 MCQ_SQATTR_OFFSET(hba->mcq_capabilities);
1473 res_mcq->end = res_mcq->start + hba->nr_hw_queues * MCQ_QCFG_SIZE - 1;
1474 res_mcq->flags = res_mem->flags;
1475 res_mcq->name = "mcq";
1476
1477 ret = insert_resource(&iomem_resource, res_mcq);
1478 if (ret) {
1479 dev_err(hba->dev, "Failed to insert MCQ resource, err=%d\n",
1480 ret);
1481 goto insert_res_err;
1482 }
1483
1484 res->base = devm_ioremap_resource(hba->dev, res_mcq);
1485 if (IS_ERR(res->base)) {
1486 dev_err(hba->dev, "MCQ registers mapping failed, err=%d\n",
1487 (int)PTR_ERR(res->base));
1488 ret = PTR_ERR(res->base);
1489 goto ioremap_err;
1490 }
1491
1492 out:
1493 hba->mcq_base = res->base;
1494 return 0;
1495 ioremap_err:
1496 res->base = NULL;
1497 remove_resource(res_mcq);
1498 insert_res_err:
1499 devm_kfree(hba->dev, res_mcq);
No need to call devm_kfree(). The whole point of devm_ is that it's
automatic.
1500 return ret;
1501 }
regards,
dan carpenter
