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[1/2] i2c: dev: fix notifier return values

Message ID 20221208182142.250084-2-brgl@bgdev.pl
State New
Headers show
Series i2c: fortify the subsystem against user-space induced deadlocks | expand

Commit Message

Bartosz Golaszewski Dec. 8, 2022, 6:21 p.m. UTC 
From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

We have a set of return values that notifier callbacks can return. They
should not return 0, error codes or anything other than those predefined
values. Make the i2c character device's callback return NOTIFY_DONE or
NOTIFY_OK depending on the situation.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/i2c/i2c-dev.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)
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Patch

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index ab0adaa130da..107623c4cc14 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -653,12 +653,12 @@  static int i2cdev_attach_adapter(struct device *dev, void *dummy)
 	int res;
 
 	if (dev->type != &i2c_adapter_type)
-		return 0;
+		return NOTIFY_DONE;
 	adap = to_i2c_adapter(dev);
 
 	i2c_dev = get_free_i2c_dev(adap);
 	if (IS_ERR(i2c_dev))
-		return PTR_ERR(i2c_dev);
+		return NOTIFY_DONE;
 
 	cdev_init(&i2c_dev->cdev, &i2cdev_fops);
 	i2c_dev->cdev.owner = THIS_MODULE;
@@ -678,11 +678,11 @@  static int i2cdev_attach_adapter(struct device *dev, void *dummy)
 		goto err_put_i2c_dev;
 
 	pr_debug("adapter [%s] registered as minor %d\n", adap->name, adap->nr);
-	return 0;
+	return NOTIFY_OK;
 
 err_put_i2c_dev:
 	put_i2c_dev(i2c_dev, false);
-	return res;
+	return NOTIFY_DONE;
 }
 
 static int i2cdev_detach_adapter(struct device *dev, void *dummy)
@@ -691,17 +691,17 @@  static int i2cdev_detach_adapter(struct device *dev, void *dummy)
 	struct i2c_dev *i2c_dev;
 
 	if (dev->type != &i2c_adapter_type)
-		return 0;
+		return NOTIFY_DONE;
 	adap = to_i2c_adapter(dev);
 
 	i2c_dev = i2c_dev_get_by_minor(adap->nr);
 	if (!i2c_dev) /* attach_adapter must have failed */
-		return 0;
+		return NOTIFY_DONE;
 
 	put_i2c_dev(i2c_dev, true);
 
 	pr_debug("adapter [%s] unregistered\n", adap->name);
-	return 0;
+	return NOTIFY_OK;
 }
 
 static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
@@ -716,7 +716,7 @@  static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
 		return i2cdev_detach_adapter(dev, NULL);
 	}
 
-	return 0;
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block i2cdev_notifier = {