linux-kernel - [PATCH v3 2/2] nvdimm: Remove dead code for ENODEV checking in scan

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Message-Id: <20240819062045.1481298-2-lizhijian@fujitsu.com>
Date: Mon, 19 Aug 2024 14:20:45 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: nvdimm@...ts.linux.dev
Cc: dan.j.williams@...el.com,
	vishal.l.verma@...el.com,
	dave.jiang@...el.com,
	ira.weiny@...el.com,
	linux-kernel@...r.kernel.org,
	Li Zhijian <lizhijian@...itsu.com>
Subject: [PATCH v3 2/2] nvdimm: Remove dead code for ENODEV checking in scan_labels()

The only way create_namespace_pmem() returns an ENODEV code is if
select_pmem_id(nd_region, &uuid) returns ENODEV when its 2nd parameter
is a null pointer. However, this is impossible because &uuid is always
valid.

Furthermore, create_namespace_pmem() is the only user of
select_pmem_id(), it's safe to remove the 'return -ENODEV' branch.

Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
V2:
  new patch.
  It's found when I'm Reviewing/tracing the return values of create_namespace_pmem()
---
 drivers/nvdimm/namespace_devs.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 35d9f3cc2efa..55cfbf1e0a95 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1612,9 +1612,6 @@ static int select_pmem_id(struct nd_region *nd_region, const uuid_t *pmem_id)
 {
 	int i;
 
-	if (!pmem_id)
-		return -ENODEV;
-
 	for (i = 0; i < nd_region->ndr_mappings; i++) {
 		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
@@ -1790,9 +1787,6 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region,
 	case -EINVAL:
 		dev_dbg(&nd_region->dev, "invalid label(s)\n");
 		break;
-	case -ENODEV:
-		dev_dbg(&nd_region->dev, "label not found\n");
-		break;
 	default:
 		dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
 		break;
@@ -1980,9 +1974,6 @@ static struct device **scan_labels(struct nd_region *nd_region)
 			case -EAGAIN:
 				/* skip invalid labels */
 				continue;
-			case -ENODEV:
-				/* fallthrough to seed creation */
-				break;
 			default:
 				goto err;
 			}
-- 
2.29.2