linux-kernel - [PATCH] misc: keba: Fix sysfs group creation

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Message-Id: <20240819192645.50171-1-gerhard@engleder-embedded.com>
Date: Mon, 19 Aug 2024 21:26:45 +0200
From: Gerhard Engleder <gerhard@...leder-embedded.com>
To: linux-kernel@...r.kernel.org
Cc: arnd@...db.de,
	gregkh@...uxfoundation.org,
	Gerhard Engleder <gerhard@...leder-embedded.com>,
	Gerhard Engleder <eg@...a.com>
Subject: [PATCH] misc: keba: Fix sysfs group creation

From: Gerhard Engleder <eg@...a.com>

sysfs_create_group() races with userspace. Use dev_groups instead which
prevents all the problems of sysfs_create_group().

Fixes: a1944676767e ("misc: keba: Add basic KEBA CP500 system FPGA support")
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Gerhard Engleder <eg@...a.com>
---
 drivers/misc/keba/cp500.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/misc/keba/cp500.c b/drivers/misc/keba/cp500.c
index 9ba46f0f9392..ae0922817881 100644
--- a/drivers/misc/keba/cp500.c
+++ b/drivers/misc/keba/cp500.c
@@ -212,12 +212,12 @@ static ssize_t keep_cfg_store(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RW(keep_cfg);
 
-static struct attribute *attrs[] = {
+static struct attribute *cp500_attrs[] = {
 	&dev_attr_version.attr,
 	&dev_attr_keep_cfg.attr,
 	NULL
 };
-static const struct attribute_group attrs_group = { .attrs = attrs };
+ATTRIBUTE_GROUPS(cp500);
 
 static void cp500_i2c_release(struct device *dev)
 {
@@ -396,20 +396,15 @@ static int cp500_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 
 	pci_set_drvdata(pci_dev, cp500);
 
-	ret = sysfs_create_group(&pci_dev->dev.kobj, &attrs_group);
-	if (ret != 0)
-		goto out_free_irq;
 
 	ret = cp500_enable(cp500);
 	if (ret != 0)
-		goto out_remove_group;
+		goto out_free_irq;
 
 	cp500_register_auxiliary_devs(cp500);
 
 	return 0;
 
-out_remove_group:
-	sysfs_remove_group(&pci_dev->dev.kobj, &attrs_group);
 out_free_irq:
 	pci_free_irq_vectors(pci_dev);
 out_disable:
@@ -427,8 +422,6 @@ static void cp500_remove(struct pci_dev *pci_dev)
 
 	cp500_disable(cp500);
 
-	sysfs_remove_group(&pci_dev->dev.kobj, &attrs_group);
-
 	pci_set_drvdata(pci_dev, 0);
 
 	pci_free_irq_vectors(pci_dev);
@@ -450,6 +443,7 @@ static struct pci_driver cp500_driver = {
 	.id_table = cp500_ids,
 	.probe = cp500_probe,
 	.remove = cp500_remove,
+	.dev_groups = cp500_groups,
 };
 module_pci_driver(cp500_driver);
 
-- 
2.39.2