linux-kernel - Re: [PATCH 4/4] net: amd-xgbe: fix comparison to bitshift when dealing with a mask

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Date:   Mon, 5 Feb 2018 16:35:34 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-kernel@...r.kernel.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH 4/4] net: amd-xgbe: fix comparison to bitshift when
 dealing with a mask

On 2/5/2018 2:10 PM, Wolfram Sang wrote:
> Due to a typo, the mask was destroyed by a comparison instead of a bit
> shift.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Excellent find.

Acked-by: Tom Lendacky <thomas.lendacky@....com>

David, this should also be applied to the 4.14 and 4.15 stable releases.

Thanks,
Tom

> ---
> Only build tested. To be applied individually per subsystem.
> 
>  drivers/net/ethernet/amd/xgbe/xgbe-drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
> index 7a3ebfd236f5eb..100adee778dfd6 100644
> --- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
> @@ -595,7 +595,7 @@ static void xgbe_isr_task(unsigned long data)
>  
>  		reissue_mask = 1 << 0;
>  		if (!pdata->per_channel_irq)
> -			reissue_mask |= 0xffff < 4;
> +			reissue_mask |= 0xffff << 4;
>  
>  		XP_IOWRITE(pdata, XP_INT_REISSUE_EN, reissue_mask);
>  	}
>