linux-kernel - [PATCH 4/5] nvmem: core: remove global nvmem_cells

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Message-Id: <20240620-nvmem-compat-name-v1-4-700e17ba3d8f@weissschuh.net>
Date: Thu, 20 Jun 2024 18:00:36 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Jiri Prchal <jiri.prchal@...ignal.cz>
Cc: linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 4/5] nvmem: core: remove global nvmem_cells_group

nvmem_cells_groups is a global variable that is also mutated.
This is complicated and error-prone.

Instead use a normal stack variable.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/nvmem/core.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 4c250f0e55ef..ed077d7e3998 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -357,11 +357,6 @@ static const struct attribute_group nvmem_bin_group = {
 	.is_bin_visible = nvmem_bin_attr_is_visible,
 };
 
-/* Cell attributes will be dynamically allocated */
-static struct attribute_group nvmem_cells_group = {
-	.name		= "cells",
-};
-
 static const struct attribute_group *nvmem_dev_groups[] = {
 	&nvmem_bin_group,
 	NULL,
@@ -423,23 +418,24 @@ static void nvmem_sysfs_remove_compat(struct nvmem_device *nvmem,
 
 static int nvmem_populate_sysfs_cells(struct nvmem_device *nvmem)
 {
-	struct bin_attribute **cells_attrs, *attrs;
+	struct attribute_group group = {
+		.name	= "cells",
+	};
 	struct nvmem_cell_entry *entry;
+	struct bin_attribute *attrs;
 	unsigned int ncells = 0, i = 0;
 	int ret = 0;
 
 	mutex_lock(&nvmem_mutex);
 
-	if (list_empty(&nvmem->cells) || nvmem->sysfs_cells_populated) {
-		nvmem_cells_group.bin_attrs = NULL;
+	if (list_empty(&nvmem->cells) || nvmem->sysfs_cells_populated)
 		goto unlock_mutex;
-	}
 
 	/* Allocate an array of attributes with a sentinel */
 	ncells = list_count_nodes(&nvmem->cells);
-	cells_attrs = devm_kcalloc(&nvmem->dev, ncells + 1,
-				   sizeof(struct bin_attribute *), GFP_KERNEL);
-	if (!cells_attrs) {
+	group.bin_attrs = devm_kcalloc(&nvmem->dev, ncells + 1,
+				       sizeof(struct bin_attribute *), GFP_KERNEL);
+	if (!group.bin_attrs) {
 		ret = -ENOMEM;
 		goto unlock_mutex;
 	}
@@ -466,13 +462,11 @@ static int nvmem_populate_sysfs_cells(struct nvmem_device *nvmem)
 			goto unlock_mutex;
 		}
 
-		cells_attrs[i] = &attrs[i];
+		group.bin_attrs[i] = &attrs[i];
 		i++;
 	}
 
-	nvmem_cells_group.bin_attrs = cells_attrs;
-
-	ret = device_add_group(&nvmem->dev, &nvmem_cells_group);
+	ret = device_add_group(&nvmem->dev, &group);
 	if (ret)
 		goto unlock_mutex;
 

-- 
2.45.2