From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     rafael@kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Borislav Petkov <bp@alien8.de>,
        Tony Luck <tony.luck@intel.com>,
        James Morse <james.morse@arm.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Robert Richter <rric@kernel.org>, linux-edac@vger.kernel.org
Subject: [PATCH 01/36] EDAC/sysfs: move to use bus_get_dev_root()
Date:   Mon, 13 Mar 2023 19:28:43 +0100
Message-Id: <20230313182918.1312597-1-gregkh@linuxfoundation.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

Cc: Borislav Petkov <bp@alien8.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: James Morse <james.morse@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Robert Richter <rric@kernel.org>
Cc: linux-edac@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Note, this is a patch that is a prepatory cleanup as part of a larger
series of patches that is working on resolving some old driver core
design mistakes.  It will build and apply cleanly on top of 6.3-rc2 on
its own, but I'd prefer if I could take it through my driver-core tree
so that the driver core changes can be taken through there for 6.4-rc1.

 drivers/edac/edac_device_sysfs.c | 16 +++++++++-------
 drivers/edac/edac_pci_sysfs.c    | 14 +++++++++-----
 2 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/drivers/edac/edac_device_sysfs.c b/drivers/edac/edac_device_sysfs.c
index ac678b4a21fc..010c26be5846 100644
--- a/drivers/edac/edac_device_sysfs.c
+++ b/drivers/edac/edac_device_sysfs.c
@@ -228,8 +228,9 @@ static struct kobj_type ktype_device_ctrl = {
  */
 int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
 {
+	struct device *dev_root;
 	struct bus_type *edac_subsys;
-	int err;
+	int err = -ENODEV;
 
 	edac_dbg(1, "\n");
 
@@ -247,15 +248,16 @@ int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
 	 */
 	edac_dev->owner = THIS_MODULE;
 
-	if (!try_module_get(edac_dev->owner)) {
-		err = -ENODEV;
+	if (!try_module_get(edac_dev->owner))
 		goto err_out;
-	}
 
 	/* register */
-	err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
-				   &edac_subsys->dev_root->kobj,
-				   "%s", edac_dev->name);
+	dev_root = bus_get_dev_root(edac_subsys);
+	if (dev_root) {
+		err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
+					   &dev_root->kobj, "%s", edac_dev->name);
+		put_device(dev_root);
+	}
 	if (err) {
 		edac_dbg(1, "Failed to register '.../edac/%s'\n",
 			 edac_dev->name);
diff --git a/drivers/edac/edac_pci_sysfs.c b/drivers/edac/edac_pci_sysfs.c
index 888d5728ecef..287cc51dbc86 100644
--- a/drivers/edac/edac_pci_sysfs.c
+++ b/drivers/edac/edac_pci_sysfs.c
@@ -337,8 +337,9 @@ static struct kobj_type ktype_edac_pci_main_kobj = {
  */
 static int edac_pci_main_kobj_setup(void)
 {
-	int err;
+	int err = -ENODEV;
 	struct bus_type *edac_subsys;
+	struct device *dev_root;
 
 	edac_dbg(0, "\n");
 
@@ -357,7 +358,6 @@ static int edac_pci_main_kobj_setup(void)
 	 */
 	if (!try_module_get(THIS_MODULE)) {
 		edac_dbg(1, "try_module_get() failed\n");
-		err = -ENODEV;
 		goto decrement_count_fail;
 	}
 
@@ -369,9 +369,13 @@ static int edac_pci_main_kobj_setup(void)
 	}
 
 	/* Instanstiate the pci object */
-	err = kobject_init_and_add(edac_pci_top_main_kobj,
-				   &ktype_edac_pci_main_kobj,
-				   &edac_subsys->dev_root->kobj, "pci");
+	dev_root = bus_get_dev_root(edac_subsys);
+	if (dev_root) {
+		err = kobject_init_and_add(edac_pci_top_main_kobj,
+					   &ktype_edac_pci_main_kobj,
+					   &dev_root->kobj, "pci");
+		put_device(dev_root);
+	}
 	if (err) {
 		edac_dbg(1, "Failed to register '.../edac/pci'\n");
 		goto kobject_init_and_add_fail;
-- 
2.39.2