linux-kernel - Re: PCMCIA insert on resume

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Message-ID: <20071027074556.GC6043@ucw.cz>
Date:	Sat, 27 Oct 2007 07:45:56 +0000
From:	Pavel Machek <pavel@....cz>
To:	Rodolfo Giometti <giometti@...eenne.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PCMCIA insert on resume

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... ?
							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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