linux-kernel - Re: [PATCH 5/5] xen-kbdfront: handle backend CLOSED without CLOSING

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Date:	Fri, 19 Oct 2012 09:34:36 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	David Vrabel <david.vrabel@...rix.com>, xen-devel@...ts.xen.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 5/5] xen-kbdfront: handle backend CLOSED without CLOSING

On Fri, Oct 19, 2012 at 09:00:59AM -0400, Konrad Rzeszutek Wilk wrote:
> On Thu, Oct 18, 2012 at 11:03:38AM +0100, David Vrabel wrote:
> > From: David Vrabel <david.vrabel@...rix.com>
> > 
> > Backend drivers shouldn't transistion to CLOSED unless the frontend is
> > CLOSED.  If a backend does transition to CLOSED too soon then the
> > frontend may not see the CLOSING state and will not properly shutdown.
> > 
> > So, treat an unexpected backend CLOSED state the same as CLOSING.
> > 
> > Signed-off-by: David Vrabel <david.vrabel@...rix.com>
> > Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > ---
> > Cc: linux-input@...r.kernel.org
> > Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> 
> Hey Dmitry,
> 
> Should I prep a git pull for you for this or are you OK giving
> an Ack for me to put this patch in my git pull for Linus?

Sure, please merge with the rest through your tree.

Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Thanks!

> 
> Thx.
> > ---
> >  drivers/input/misc/xen-kbdfront.c |    5 ++++-
> >  1 files changed, 4 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
> > index 02ca868..6f7d990 100644
> > --- a/drivers/input/misc/xen-kbdfront.c
> > +++ b/drivers/input/misc/xen-kbdfront.c
> > @@ -311,7 +311,6 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
> >  	case XenbusStateReconfiguring:
> >  	case XenbusStateReconfigured:
> >  	case XenbusStateUnknown:
> > -	case XenbusStateClosed:
> >  		break;
> >  
> >  	case XenbusStateInitWait:
> > @@ -350,6 +349,10 @@ InitWait:
> >  
> >  		break;
> >  
> > +	case XenbusStateClosed:
> > +		if (dev->state == XenbusStateClosed)
> > +			break;
> > +		/* Missed the backend's CLOSING state -- fallthrough */
> >  	case XenbusStateClosing:
> >  		xenbus_frontend_closed(dev);
> >  		break;
> > -- 
> > 1.7.2.5

-- 
Dmitry
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