Re: [PATCH 1/1] usb: gadget: f_hid: Conduct proper refcounting on shared f_hidg pointer

[Greg KH]

On Thu, Nov 17, 2022 at 12:08:13PM +0000, Lee Jones wrote:
> +static inline bool f_hidg_is_open(struct f_hidg *hidg)
> +{
> +	return !!kref_read(&hidg->cdev.kobj.kref);
> +}

Ick, sorry, no, that's not going to work and is not allowed at all.
That's some major layering violations there, AND it can change after you
get the value as well.

greg k-h