linux-kernel - Re: [PATCH] input: joystick: pxrc: use usb_get

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Message-ID: <YP2m1IG6ilw5aTXH@google.com>
Date:   Sun, 25 Jul 2021 11:00:52 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Salah Triki <salah.triki@...il.com>,
        Marcus Folkesson <marcus.folkesson@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: joystick: pxrc: use usb_get_intf()

On Sun, Jul 25, 2021 at 08:31:47AM +0200, Greg KH wrote:
> On Sat, Jul 24, 2021 at 10:36:17PM +0100, Salah Triki wrote:
> > Use usb_get_intf() in order to increment reference count of the usb
> > interface structure.
> > 
> > Signed-off-by: Salah Triki <salah.triki@...il.com>
> > ---
> >  drivers/input/joystick/pxrc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/input/joystick/pxrc.c b/drivers/input/joystick/pxrc.c
> > index ea2bf5951d67..59304352548b 100644
> > --- a/drivers/input/joystick/pxrc.c
> > +++ b/drivers/input/joystick/pxrc.c
> > @@ -143,7 +143,7 @@ static int pxrc_probe(struct usb_interface *intf,
> >  		return -ENOMEM;
> >  
> >  	mutex_init(&pxrc->pm_mutex);
> > -	pxrc->intf = intf;
> > +	pxrc->intf = usb_get_intf(intf);
> >  
> >  	usb_set_intfdata(pxrc->intf, pxrc);
> >  
> > -- 
> 
> You can not add a reference and never drop it :(

On top of that taking a reference here is not useful as the interface
must be valid until disconnect() call.

Thanks.

-- 
Dmitry