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authorDaeseok Youn <daeseok.youn@gmail.com>2014-06-04 16:08:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:54:04 -0700
commitcc6b664aa26de93d9a3f99d4021a8d88b434ed06 (patch)
treea80c441a939e3a6bd8f9d703b1e89f34fa1ecb6a /mm/dmapool.c
parent1754e44e8291c92b9d981a6eca59f28dd25f03ab (diff)
downloadlinux-stericsson-cc6b664aa26de93d9a3f99d4021a8d88b434ed06.tar.gz
mm/dmapool.c: remove redundant NULL check for dev in dma_pool_create()
"dev" cannot be NULL because it is already checked before calling dma_pool_create(). If dev ever was NULL, the code would oops in dev_to_node() after enabling CONFIG_NUMA. It is possible that some driver is using dev==NULL and has never been run on a NUMA machine. Such a driver is probably outdated, possibly buggy and will need some attention if it starts triggering NULL derefs. Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/dmapool.c')
-rw-r--r--mm/dmapool.c24
1 files changed, 8 insertions, 16 deletions
diff --git a/mm/dmapool.c b/mm/dmapool.c
index 8058fcd7ae91..a3a1bfe91110 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -170,24 +170,16 @@ struct dma_pool *dma_pool_create(const char *name, struct device *dev,
retval->boundary = boundary;
retval->allocation = allocation;
- if (dev) {
- int ret;
+ INIT_LIST_HEAD(&retval->pools);
- mutex_lock(&pools_lock);
- if (list_empty(&dev->dma_pools))
- ret = device_create_file(dev, &dev_attr_pools);
- else
- ret = 0;
- /* note: not currently insisting "name" be unique */
- if (!ret)
- list_add(&retval->pools, &dev->dma_pools);
- else {
- kfree(retval);
- retval = NULL;
- }
- mutex_unlock(&pools_lock);
+ mutex_lock(&pools_lock);
+ if (list_empty(&dev->dma_pools) &&
+ device_create_file(dev, &dev_attr_pools)) {
+ kfree(retval);
+ return NULL;
} else
- INIT_LIST_HEAD(&retval->pools);
+ list_add(&retval->pools, &dev->dma_pools);
+ mutex_unlock(&pools_lock);
return retval;
}