linux-kernel - Re: [PATCH 5.4 65/90] Input: aiptek - use descriptors of current altsetting

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Date:   Tue, 4 Feb 2020 11:18:55 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Vladis Dronov <vdronov@...hat.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.4 65/90] Input: aiptek - use descriptors of current
 altsetting

On Tue, Feb 04, 2020 at 10:03:32AM +0000, Greg Kroah-Hartman wrote:
> On Tue, Feb 04, 2020 at 09:11:55AM +0100, Johan Hovold wrote:
> > On Mon, Feb 03, 2020 at 04:20:08PM +0000, Greg Kroah-Hartman wrote:
> > > From: Johan Hovold <johan@...nel.org>
> > > 
> > > [ Upstream commit cfa4f6a99fb183742cace65ec551b444852b8ef6 ]
> > > 
> > > Make sure to always use the descriptors of the current alternate setting
> > > to avoid future issues when accessing fields that may differ between
> > > settings.
> > > 
> > > Signed-off-by: Johan Hovold <johan@...nel.org>
> > > Acked-by: Vladis Dronov <vdronov@...hat.com>
> > > Link: https://lore.kernel.org/r/20191210113737.4016-4-johan@kernel.org
> > > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > > ---
> > >  drivers/input/tablet/aiptek.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/input/tablet/aiptek.c b/drivers/input/tablet/aiptek.c
> > > index 06d0ffef4a171..e08b0ef078e81 100644
> > > --- a/drivers/input/tablet/aiptek.c
> > > +++ b/drivers/input/tablet/aiptek.c
> > > @@ -1713,7 +1713,7 @@ aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
> > >  
> > >  	aiptek->inputdev = inputdev;
> > >  	aiptek->intf = intf;
> > > -	aiptek->ifnum = intf->altsetting[0].desc.bInterfaceNumber;
> > > +	aiptek->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
> > >  	aiptek->inDelay = 0;
> > >  	aiptek->endDelay = 0;
> > >  	aiptek->previousJitterable = 0;
> > 
> > I asked Sasha to drop this one directly when he added it, so it's
> > probable gone from all the stable queues by now.
> 
> Oops, no, let me go drop it.
> 
> > But I'm still curious how this ended up being selected for stable in the
> > first place? There's no fixes or stable tag in the commit, and I never
> > received a mail from the AUTOSEL scripts.
> 
> I don't know, there was a bunch of last-minute patches picked up for
> this round based on some "fixes needed due to other fixes".

Ah, yeah, could be dependencies otherwise, but then you usually send a
notice about that. And in this case this is the last commit to this
particular driver in Linus's tree too.

Johan