linux-kernel - Re: [PATCH -next] net: wan: sdla: Use bitwise instead of arithmetic

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Date:   Fri, 30 Oct 2020 01:58:59 -0700
From:   Xie He <xie.he.0141@...il.com>
To:     Zou Wei <zou_wei@...wei.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] net: wan: sdla: Use bitwise instead of arithmetic

> Fix the following coccinelle warnings:
>
> ./drivers/net/wan/sdla.c:841:38-39: WARNING: sum of probable bitmasks, consider |
>
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Zou Wei <zou_wei@...wei.com>
> ---
>  drivers/net/wan/sdla.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wan/sdla.c b/drivers/net/wan/sdla.c
> index bc2c1c7..cf43f4c 100644
> --- a/drivers/net/wan/sdla.c
> +++ b/drivers/net/wan/sdla.c
> @@ -838,7 +838,8 @@ static void sdla_receive(struct net_device *dev)
>  		case SDLA_S502A:
>  		case SDLA_S502E:
>  			if (success)
> -				__sdla_read(dev, SDLA_502_RCV_BUF + SDLA_502_DATA_OFS, skb_put(skb,len), len);
> +				__sdla_read(dev, SDLA_502_RCV_BUF | SDLA_502_DATA_OFS,
> +					    skb_put(skb, len), len);
>  
>  			SDLA_WINDOW(dev, SDLA_502_RCV_BUF);
>  			cmd->opp_flag = 0;

No, this is not a bit-OR. This is a sum. The argument is an address,
SDLA_502_RCV_BUF is a base address, SDLA_502_DATA_OFS is an offset.
They should be sumed instead of bit-OR'ed.