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Subject[PATCH] 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

Signed-off-by: Dan Carpenter <>
There are still at least two drivers which do pass a NULL unfortunately.

drivers/staging/comedi/drivers/comedi_isadma.c:195 comedi_isadma_alloc() error: NULL dereference inside function 'dma_alloc_coherent()'
drivers/staging/comedi/drivers/comedi_isadma.c:227 comedi_isadma_free() error: NULL dereference inside function 'dma_free_coherent()'
drivers/tty/synclink.c:3667 mgsl_alloc_buffer_list_memory() error: NULL dereference inside function 'dma_alloc_coherent()'
drivers/tty/synclink.c:3738 mgsl_free_buffer_list_memory() error: NULL dereference inside function 'dma_free_coherent()'
drivers/tty/synclink.c:3777 mgsl_alloc_frame_memory() error: NULL dereference inside function 'dma_alloc_coherent()'
drivers/tty/synclink.c:3811 mgsl_free_frame_memory() error: NULL dereference inside function 'dma_free_coherent()'

If I remember right there are one or two others which sometimes pass a
NULL, but it's harder to grep for those warnings.

kernel/dma/mapping.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 685a53f2a793..f7afdadb6770 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -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;
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