linux-kernel - Re: [patch] driver-core: dev_to_node() should handle NULL pointers

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Message-ID: <20120720150042.GA1996@kroah.com>
Date:	Fri, 20 Jul 2012 08:00:42 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] driver-core: dev_to_node() should handle NULL pointers

On Fri, Jul 20, 2012 at 09:56:23AM +0300, Dan Carpenter wrote:
> What prompted this patch is that in dma_pool_create() we call
> dev_to_node() before checking whether "dev" is NULL.  It looks like
> there are places which call dma_pool_create() with a NULL pointer.  An
> example is in drivers/usb/gadget/amd5536udc.c.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> Static checker fix.
> 
> diff --git a/include/linux/device.h b/include/linux/device.h
> index aa7b3b4..c80e7a8d 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -714,7 +714,9 @@ int dev_set_name(struct device *dev, const char *name, ...);
>  #ifdef CONFIG_NUMA
>  static inline int dev_to_node(struct device *dev)
>  {
> -	return dev->numa_node;
> +	if (dev)
> +		return dev->numa_node;
> +	return -1;

What happens if this function returns -1?  Can the callers properly
handle this?

thanks,

greg k-h
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