linux-kernel - Re: [PATCH] tablet: acecad: update the reference count of the usb interface structure

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Message-ID: <20210729005427.GA784014@pc>
Date:   Thu, 29 Jul 2021 01:54:27 +0100
From:   Salah Triki <salah.triki@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Fabio Aiuto <fabioaiuto83@...il.com>,
        Ross Schmidt <ross.schm.dev@...il.com>,
        Marco Cesati <marcocesati@...il.com>,
        Brother Matthew De Angelis <matthew.v.deangelis@...il.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Ivan Safonov <insafonov@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tablet: acecad: update the reference count of the usb
 interface structure

On Tue, Jul 27, 2021 at 03:37:56PM +0300, Dan Carpenter wrote:
> This commit message doesn't say what the user visible effects are.  If
> you encountered this bug at runtime then please put the stack trace in
> the commit mesage.
> 

I made this patch based on the following documentation of
usb_get_intf():

[quote]
Each live reference to a interface must be refcounted.

Drivers for USB interfaces should normally record such references 
in their probe methods, when they bind to an interface, and release them 
by calling usb_put_intf, in their disconnect methods.

[/quote]

Thanx