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dma-mapping: remove an unnecessary NULL check 

We already dereferenced "dev" when we called get_dma_ops() so this NULL
check is too late.  We're not supposed to pass NULL "dev" pointers to
dma_alloc_attrs().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dan Carpenter 2019-04-24 17:24:37 +03:00 committed by Christoph Hellwig
parent e43e2657fe
commit 148a97d5a0
1 changed files with 1 additions and 1 deletions
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kernel/dma/mapping.c
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@ -244,7 +244,7 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
const struct dma_map_ops *ops = get_dma_ops(dev);
void *cpu_addr;
WARN_ON_ONCE(dev && !dev->coherent_dma_mask);
WARN_ON_ONCE(!dev->coherent_dma_mask);
if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
return cpu_addr;