linux-kernel - Re: [PATCH v3 15/24] media: exynos4-is: Remove call to memset after dma_alloc

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Date:   Mon, 15 Jul 2019 11:01:21 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Fuqian Huang <huangfq.daxian@...il.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 15/24] media: exynos4-is: Remove call to memset after
 dma_alloc_coherent

On 7/15/19 05:18, Fuqian Huang wrote:
> In commit 518a2f1925c3
> ("dma-mapping: zero memory returned from dma_alloc_*"),
> dma_alloc_coherent has already zeroed the memory.
> So memset is not needed

I can't see any changes in the above mentioned commit that would
make dma_alloc_coherent() (arm_coherent_dma_alloc()) zeroing its
returned memory. Maybe you need to add a reference to some other
instead?

> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>

>  drivers/media/platform/exynos4-is/fimc-is.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/media/platform/exynos4-is/fimc-is.c b/drivers/media/platform/exynos4-is/fimc-is.c
> index e043d55133a3..77633e356305 100644
> --- a/drivers/media/platform/exynos4-is/fimc-is.c
> +++ b/drivers/media/platform/exynos4-is/fimc-is.c
> @@ -341,7 +341,6 @@ static int fimc_is_alloc_cpu_memory(struct fimc_is *is)
>  		return -ENOMEM;
>  
>  	is->memory.size = FIMC_IS_CPU_MEM_SIZE;
> -	memset(is->memory.vaddr, 0, is->memory.size);
--
Thanks, 
Sylwester