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Documentation: Correct return type of my_read and my_write functions #419

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Documentation: Correct return type of my_read and my_write functions #419

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6 changes: 3 additions & 3 deletions Documentation/teaching/labs/device_drivers.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -220,7 +220,7 @@ my_device_data:
//...
}

static int my_read(struct file *file, char __user *user_buffer, size_t size, loff_t *offset)
static ssize_t my_read(struct file *file, char __user *user_buffer, size_t size, loff_t *offset)
{
struct my_device_data *my_data;

Expand Down Expand Up @@ -525,7 +525,7 @@ into account the internal buffer size, user buffer size and the offset:

.. code-block:: c

static int my_read(struct file *file, char __user *user_buffer,
static ssize_t my_read(struct file *file, char __user *user_buffer,
size_t size, loff_t *offset)
{
struct my_device_data *my_data = (struct my_device_data *) file->private_data;
Expand Down Expand Up @@ -565,7 +565,7 @@ The structure of the write function is similar:

.. code-block:: c

static int my_write(struct file *file, const char __user *user_buffer,
static ssize_t my_write(struct file *file, const char __user *user_buffer,
size_t size, loff_t * offset)
{
struct my_device_data *my_data = (struct my_device_data *) file->private_data;
Expand Down