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SubjectRe: [PATCH v10 13/15] platform/x86: wmi: create userspace interface for drivers
On Thu, Oct 19, 2017 at 12:50:16PM -0500, Mario Limonciello wrote:
> +static ssize_t wmi_char_read(struct file *filp, char __user *buffer,
> + size_t length, loff_t *offset)
> +{
> + struct wmi_block *wblock = filp->private_data;
> + size_t count;
> +
> + if (*offset != 0)
> + return 0;
> +
> + count = sizeof(wblock->req_buf_size);
> + count = length < count ? length : count;
> +
> + if (copy_to_user(buffer, &wblock->req_buf_size, count))
> + return -EFAULT;
> +
> + *offset = count;
> + return count;

simple_read_from_buffer()? Library functions are your friend :)

thanks,

greg k-h

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