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

Dmitry Torokhov
2024-07-03T21:38:11Z

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@gmail.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