linux-kernel - Re: [PATCH] uio: uio_pdrv

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Message-ID: <aec7e5c30807110145s1106bb2bs60026400390e3de3@mail.gmail.com>
Date:	Fri, 11 Jul 2008 17:45:48 +0900
From:	"Magnus Damm" <magnus.damm@...il.com>
To:	"Hans J. Koch" <hjk@...utronix.de>
Cc:	"Uwe Kleine-König" <Uwe.Kleine-Koenig@...i.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"lethal@...ux-sh.org" <lethal@...ux-sh.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] uio: uio_pdrv_genirq V2

On Thu, Jul 10, 2008 at 7:58 PM, Hans J. Koch <hjk@...utronix.de> wrote:
> On Thu, Jul 10, 2008 at 08:56:39AM +0200, Uwe Kleine-König wrote:
>> > +       ret = uio_register_device(&pdev->dev, priv->uioinfo);
>> > +       if (ret) {
>> > +               dev_err(&pdev->dev, "unable to register uio device\n");
>> > +               goto bad1;
>> > +       }
>> > +
>> > +       platform_set_drvdata(pdev, priv);
>> This should probably go before uio_register_device.  (Uups, this is an
>> issue for uio_pdrv, too.)
>
> Yes, because uio_register_device will enable the irq, and you might
> arrive in the handler without having your platform data in place.

I'd say that this is a non-issue.

Only uio_pdrv_genirq_remove() is using the platform data. This
remove() method won't be called if uio_pdrv_genirq_probe() returns
failure. The UIO subsystem is using uioinfo->priv which of course is
set up correctly already.

Thanks,

/ magnus
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