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SubjectRe: [PATCH] lib/genalloc.c: add check gen_pool_dma_alloc() if dma pointer is not NULL
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Hi Prabhakar,

On 23 January 2014 15:26, Prabhakar Lad <prabhakar.csengg@gmail.com> wrote:
> From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
>
> In the gen_pool_dma_alloc() the dma pointer can be NULL
> and while assigning gen_pool_virt_to_phys(pool, vaddr) to
> dma caused the following crash on da850 evm,
>
[snip]
>
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
> ---
> lib/genalloc.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/lib/genalloc.c b/lib/genalloc.c
> index dda3116..f48163f 100644
> --- a/lib/genalloc.c
> +++ b/lib/genalloc.c
> @@ -334,7 +334,8 @@ void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
> if (!vaddr)
> return NULL;
>
> - *dma = gen_pool_virt_to_phys(pool, vaddr);
> + if (dma)
> + *dma = gen_pool_virt_to_phys(pool, vaddr);

Wouldn't it be better to return (with error/message) if dma is NULL
rather than silently ignore it?

>
> return (void *)vaddr;


--
With warm regards,
Sachin


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