Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Message-ID: <e0b2984e7de0287c5811a10faaac4d5d6d7d91ef.camel@suse.com>
Subject: Re: [PATCH 3/4] USB: serial: add support for multi-interface
 functions
From:   Oliver Neukum <oneukum@suse.com>
To:     Johan Hovold <johan@kernel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Date:   Tue, 30 Mar 2021 16:44:32 +0200
In-Reply-To: <20210330143820.9103-4-johan@kernel.org>
References: <20210330143820.9103-1-johan@kernel.org>
         <20210330143820.9103-4-johan@kernel.org>
Content-Type: text/plain; charset="UTF-8"
User-Agent: Evolution 3.34.4 
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Precedence: bulk

Am Dienstag, den 30.03.2021, 16:38 +0200 schrieb Johan Hovold:
> @@ -1115,6 +1161,8 @@ static void usb_serial_disconnect(struct usb_interface *interface)
>         if (serial->type->disconnect)
>                 serial->type->disconnect(serial);
>  
> +       release_sibling(serial, interface);
> +
>         /* let the last holder of this object cause it to be cleaned up */
>         usb_serial_put(serial);
>         dev_info(dev, "device disconnected\n");

Hi,

does this assume you are called for the original interface first?
I am afraid that is an assumption you cannot make. In fact, if somebody
is doing odd things with sysfs you cannot even assume both will see a
disconnect()

	Regards
		Oliver