linux-kernel - Re: [PATCH v2] mm: fix null dev in dma_pool

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Date:	Tue, 13 Nov 2012 15:01:34 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Xi Wang <xi.wang@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm: fix null dev in dma_pool_create()

On Tue, 13 Nov 2012, Xi Wang wrote:

> diff --git a/mm/dmapool.c b/mm/dmapool.c
> index c5ab33b..bf7f8f0 100644
> --- a/mm/dmapool.c
> +++ b/mm/dmapool.c
> @@ -135,6 +135,7 @@ struct dma_pool *dma_pool_create(const char *name, struct device *dev,
>  {
>  	struct dma_pool *retval;
>  	size_t allocation;
> +	int node;
>  
>  	if (align == 0) {
>  		align = 1;
> @@ -159,7 +160,9 @@ struct dma_pool *dma_pool_create(const char *name, struct device *dev,
>  		return NULL;
>  	}
>  
> -	retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, dev_to_node(dev));
> +	node = WARN_ON(!dev) ? -1 : dev_to_node(dev);
> +
> +	retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, node);
>  	if (!retval)
>  		return retval;
>  

Begs the question why we don't just do something like this generically?
---
diff --git a/include/linux/device.h b/include/linux/device.h
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -718,7 +718,7 @@ 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;
+	return WARN_ON(!dev) ? NUMA_NO_NODE : dev->numa_node;
 }
 static inline void set_dev_node(struct device *dev, int node)
 {
--
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