linux-kernel - Re: [PATCH 1/1] usb: gadget: f_hid: Conduct proper refcounting on shared f

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Message-ID: <Y3YuL8rSE9pNfIZN@kroah.com>
Date:   Thu, 17 Nov 2022 13:50:55 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Lee Jones <lee@...nel.org>
Cc:     balbi@...nel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/1] usb: gadget: f_hid: Conduct proper refcounting on
 shared f_hidg pointer

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