linux-kernel - [PATCH 2/3] drm/komeda: Memory manage struct komeda

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20191004143418.53039-3-mihail.atanassov@arm.com>
Date:   Fri, 4 Oct 2019 14:34:39 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     Mihail Atanassov <Mihail.Atanassov@....com>, nd <nd@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>,
        Liviu Dudau <Liviu.Dudau@....com>,
        Brian Starkey <Brian.Starkey@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Russell King <linux@...linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] drm/komeda: Memory manage struct komeda_drv in
 probe/remove

Some fields of komeda_drv members will be useful very early
in probe code, so make sure an instance is available.

Signed-off-by: Mihail Atanassov <mihail.atanassov@....com>
---
 .../gpu/drm/arm/display/komeda/komeda_drv.c   | 30 +++++++++++--------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
index 660181bdc008..9ed25ffe0e22 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -32,22 +32,15 @@ static void komeda_unbind(struct device *dev)
 	if (!mdrv)
 		return;
 
-	komeda_kms_fini(mdrv->kms);
-	komeda_dev_fini(mdrv->mdev);
-
-	dev_set_drvdata(dev, NULL);
-	devm_kfree(dev, mdrv);
+	komeda_kms_fini(&mdrv->kms);
+	komeda_dev_fini(&mdrv->mdev);
 }
 
 static int komeda_bind(struct device *dev)
 {
-	struct komeda_drv *mdrv;
+	struct komeda_drv *mdrv = dev_get_drvdata(dev);
 	int err;
 
-	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
-	if (!mdrv)
-		return -ENOMEM;
-
 	err = komeda_dev_init(&mdrv->mdev, dev);
 	if (err)
 		goto free_mdrv;
@@ -56,8 +49,6 @@ static int komeda_bind(struct device *dev)
 	if (err)
 		goto fini_mdev;
 
-	dev_set_drvdata(dev, mdrv);
-
 	return 0;
 
 fini_mdev:
@@ -97,10 +88,15 @@ static int komeda_platform_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct component_match *match = NULL;
 	struct device_node *child;
+	struct komeda_drv *mdrv;
 
 	if (!dev->of_node)
 		return -ENODEV;
 
+	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
+	if (!mdrv)
+		return -ENOMEM;
+
 	for_each_available_child_of_node(dev->of_node, child) {
 		if (of_node_cmp(child->name, "pipeline") != 0)
 			continue;
@@ -110,12 +106,20 @@ static int komeda_platform_probe(struct platform_device *pdev)
 		komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 1);
 	}
 
+	dev_set_drvdata(dev, mdrv);
+
 	return component_master_add_with_match(dev, &komeda_master_ops, match);
 }
 
 static int komeda_platform_remove(struct platform_device *pdev)
 {
-	component_master_del(&pdev->dev, &komeda_master_ops);
+	struct device *dev = &pdev->dev;
+	struct komeda_drv *mdrv = dev_get_drvdata(dev);
+
+	component_master_del(dev, &komeda_master_ops);
+
+	dev_set_drvdata(dev, NULL);
+	devm_kfree(dev, mdrv);
 	return 0;
 }
 
-- 
2.23.0