netdev - Re: [PATCH] korina: fix probing crash

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Date:	Mon, 12 Jan 2009 21:52:02 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	florian@...nwrt.org
Cc:	jeff@...zik.org, netdev@...r.kernel.org, n0-1@...ewrt.org
Subject: Re: [PATCH] korina: fix probing crash

From: Florian Fainelli <florian@...nwrt.org>
Date: Sun, 11 Jan 2009 16:54:24 +0100

> korina: fix probing crash
> 
> This patch fixes the wrong retrieval of platform_data
> which makes the driver crash on probe. Propagate error
> if the platform_driver cannot use its data.
> 
> Signed-off-by: Florian Fainelli <florian@...nwrt.org>

There are several problems with this patch:

> @@ -1078,12 +1078,18 @@ static int korina_close(struct net_device *dev)
>  
>  static int korina_probe(struct platform_device *pdev)
>  {
> -	struct korina_device *bif = platform_get_drvdata(pdev);
> +	struct korina_device *bif;
>  	struct korina_private *lp;
>  	struct net_device *dev;
>  	struct resource *r;
>  	int rc;
>  
> +	bif = (struct korina_device *)pdev->dev.platform_data;

This cast is unnecessary, platform_data is "void *"

Secondly, korina_remove() also expects the korina_device pointer to be
in the platform drvdata.  It therefore has the same bug as
korina_probe() and needs to be fixed too.

But I suspect there is some other weird problem here.  If
you need to change from drvdata over to platform_data, then
this driver never could have been probed or removed properly.

This is absolutely a fundamental bug, where did it come from?
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