linux-kernel - Re: PCMCIA insert on resume

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Message-Id: <200710281955.52798.rjw@sisk.pl>
Date:	Sun, 28 Oct 2007 19:55:52 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Rodolfo Giometti <giometti@...eenne.com>,
	linux-kernel@...r.kernel.org,
	Russell King <rmk+lkml@....linux.org.uk>
Subject: Re: PCMCIA insert on resume

On Saturday, 27 October 2007 09:45, Pavel Machek wrote:
> Hi!
> 
> > I don't understand why, on resume, the function socket_resume() (in
> > drivers/pcmcia/cs.c) do:
> > 
> >        if (!(skt->state & SOCKET_PRESENT)) {
> >                skt->state &= ~SOCKET_SUSPEND;
> >                return socket_insert(skt);
> >        }
> > 
> > This cause a powered off socket before suspend to be powered on during
> > resume.
> > 
> > To avoid such (erroneous?) behaviour I propose this patch:
> > 
> > diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
> > index 729e37d..d69de74 100644
> > --- a/drivers/pcmcia/cs.c
> > +++ b/drivers/pcmcia/cs.c
> > @@ -562,10 +562,8 @@ static int socket_resume(struct pcmcia_socket *skt)
> >         skt->ops->init(skt);
> >         skt->ops->set_socket(skt, &skt->socket);
> >  
> > -       if (!(skt->state & SOCKET_PRESENT)) {
> > -               skt->state &= ~SOCKET_SUSPEND;
> > -               return socket_insert(skt);
> > -       }
> > +       if (!(skt->state & SOCKET_PRESENT))
> > +               goto resume_exit;
> >  
> >         ret = socket_setup(skt, SS_COMA, resume_delay);
> >         if (ret == CS_SUCCESS) {
> > @@ -599,6 +597,7 @@ static int socket_resume(struct pcmcia_socket *skt)
> >                 socket_shutdown(skt);
> >         }
> >  
> > +resume_exit:
> >         skt->state &= ~SOCKET_SUSPEND;
> >  
> >         return CS_SUCCESS;
> > 
> > With this patch if the socket was powered down before the suspend, at
> > resume time it's not powered on and you need a "pccardctl insert" to
> > activate the socket.
> 
> Seems okay to me, but I do not know much about pcmcia. Add
> signed-off-by, changelog at the beggining, cc me, rafael and akpm... ?

Actually, there are some objections wrt this patch from Russell King.

Greetings,
Rafael
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