linux-kernel - [PATCH v2 5/7] Input: rearrange input_alloc_device() to prepare for preallocating of vals

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Message-ID: <20240703213756.3375978-6-dmitry.torokhov@gmail.com>
Date: Wed,  3 Jul 2024 14:37:52 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: linux-input@...r.kernel.org
Cc: Benjamin Tissoires <bentiss@...nel.org>,
	Jeff LaBundy <jeff@...undy.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/7] Input: rearrange input_alloc_device() to prepare for preallocating of vals

In preparation to have dev->vals memory pre-allocated rearrange
code in input_alloc_device() so that it allows handling multiple
points of failure.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/input.c | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 40a04154f99d..9981fdfaee9f 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1982,21 +1982,28 @@ struct input_dev *input_allocate_device(void)
 	struct input_dev *dev;
 
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-	if (dev) {
-		dev->dev.type = &input_dev_type;
-		dev->dev.class = &input_class;
-		device_initialize(&dev->dev);
-		mutex_init(&dev->mutex);
-		spin_lock_init(&dev->event_lock);
-		timer_setup(&dev->timer, NULL, 0);
-		INIT_LIST_HEAD(&dev->h_list);
-		INIT_LIST_HEAD(&dev->node);
-
-		dev_set_name(&dev->dev, "input%lu",
-			     (unsigned long)atomic_inc_return(&input_no));
-
-		__module_get(THIS_MODULE);
-	}
+	if (!dev)
+		return NULL;
+
+	mutex_init(&dev->mutex);
+	spin_lock_init(&dev->event_lock);
+	timer_setup(&dev->timer, NULL, 0);
+	INIT_LIST_HEAD(&dev->h_list);
+	INIT_LIST_HEAD(&dev->node);
+
+	dev->dev.type = &input_dev_type;
+	dev->dev.class = &input_class;
+	device_initialize(&dev->dev);
+	/*
+	 * From this point on we can no longer simply "kfree(dev)", we need
+	 * to use input_free_device() so that device core properly frees its
+	 * resources associated with the input device.
+	 */
+
+	dev_set_name(&dev->dev, "input%lu",
+		     (unsigned long)atomic_inc_return(&input_no));
+
+	__module_get(THIS_MODULE);
 
 	return dev;
 }
-- 
2.45.2.803.g4e1b14247a-goog