From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx177.postini.com [74.125.245.177]) by kanga.kvack.org (Postfix) with SMTP id AAEFB6B004D for ; Tue, 13 Nov 2012 18:01:38 -0500 (EST) Received: by mail-pb0-f41.google.com with SMTP id xa7so1809650pbc.14 for ; Tue, 13 Nov 2012 15:01:38 -0800 (PST) Date: Tue, 13 Nov 2012 15:01:34 -0800 (PST) From: David Rientjes Subject: Re: [PATCH v2] mm: fix null dev in dma_pool_create() In-Reply-To: <50A2BE19.7000604@gmail.com> Message-ID: References: <1352097996-25808-1-git-send-email-xi.wang@gmail.com> <50A2BE19.7000604@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Xi Wang Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org 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) { -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org