linux-kernel - Re: [patch 2.6.30-rc3] platform_bus: remove "which platform

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090429040810.GI23062@kroah.com>
Date:	Tue, 28 Apr 2009 21:08:11 -0700
From:	Greg KH <greg@...ah.com>
To:	David Brownell <david-b@...bell.net>,
	Ming Lei <tom.leiming@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2.6.30-rc3] platform_bus:  remove "which
	platform_data?" confusion

On Mon, Apr 27, 2009 at 07:43:40PM -0700, David Brownell wrote:
> From: David Brownell <dbrownell@...rs.sourceforge.net>
> 
> Recent patches have caused platform_device_add_pdata() users
> to trigger confused "use which platform_data?" error messages
> from the kernel.  ("The _only_ one you were given, dummy!" is
> the correct answer.)
> 
> This patch fixes those messages so they only appear if there's
> reason to be confused.  (The call should probably fail too...)
> 
> Those patches seem to support what I think is a misguided
> notion:  that somehow device.platform_data might move into
> the platform_device.  The problem with that idea is that it's
> a general purpose hook, and is used by other busses to provide
> board-specific configuration data ... not just for platform_bus.
> 
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
> ---

Ming, what do you think of this?

thanks,

greg k-h


> For 2.6.30, which recently acquired this confusion.
> 
>  drivers/base/platform.c |   22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
> 
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -251,16 +251,20 @@ int platform_device_add(struct platform_
>  	* if all platform devices pass its platform specific data
>  	* from platform_device. The conversion is going to be a
>  	* long time, so we allow the two cases coexist to make
> -	* this kind of fix more easily*/
> -	if (pdev->platform_data && pdev->dev.platform_data) {
> -		printk(KERN_ERR
> -			       "%s: use which platform_data?\n",
> -			       dev_name(&pdev->dev));
> -	} else if (pdev->platform_data) {
> -		pdev->dev.platform_data = pdev->platform_data;
> -	} else if (pdev->dev.platform_data) {
> +	* this kind of fix more easily
> +	*
> +	* REVISIT platform_data is used by more than "platform_bus".
> +	* It's a generic hook for data that's specific to a given
> +	* board.  Removing it seems rather impractical...
> +	*/
> +	if (!pdev->platform_data)
>  		pdev->platform_data = pdev->dev.platform_data;
> -	}
> +	else if (!pdev->dev.platform_data)
> +		pdev->dev.platform_data = pdev->platform_data;
> +
> +	if (pdev->platform_data != pdev->dev.platform_data)
> +		pr_err("%s: use which platform_data?\n",
> +			       dev_name(&pdev->dev));
>  
>  	for (i = 0; i < pdev->num_resources; i++) {
>  		struct resource *p, *r = &pdev->resource[i];
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/