linux-kernel - Re: [PATCH 2/6] fpga: zynqmp: Initialized variables before using it

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Date:   Fri, 11 Mar 2022 22:28:14 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Nava kishore Manne <nava.manne@...inx.com>
Cc:     mdf@...nel.org, hao.wu@...el.com, trix@...hat.com,
        michal.simek@...inx.com, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/6] fpga: zynqmp: Initialized variables before using it

On Tue, Mar 08, 2022 at 03:15:15PM +0530, Nava kishore Manne wrote:
> This patch initialized variables with the proper value.
> Addresses-Coverity: "uninit_use: Using uninitialized value"
> 
> Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> ---
>  drivers/fpga/zynqmp-fpga.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c
> index c60f20949c47..e931d69819a7 100644
> --- a/drivers/fpga/zynqmp-fpga.c
> +++ b/drivers/fpga/zynqmp-fpga.c
> @@ -41,7 +41,7 @@ static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
>  				 const char *buf, size_t size)
>  {
>  	struct zynqmp_fpga_priv *priv;
> -	dma_addr_t dma_addr;
> +	dma_addr_t dma_addr = 0;

The first use of this variable is as an output parameter:

	kbuf = dma_alloc_coherent(priv->dev, size, &dma_addr, GFP_KERNEL);

So I don't think it needs to be initialized as 0.

Thanks,
Yilun

>  	u32 eemi_flags = 0;
>  	char *kbuf;
>  	int ret;
> -- 
> 2.25.1