Subject: Re: [PATCH 08/14] net: ks8851: Use 16-bit read of RXFC register

From: Andrew Lunn <[email-masked]>
Date: Tue, 24 Mar 2020 02:50:41 +0100

> @@ -470,7 +455,7 @@ static void ks8851_rx_pkts(struct ks8851_net *ks)
>  	unsigned rxstat;
>  	u8 *rxpkt;
>  
> -	rxfc = ks8851_rdreg8(ks, KS_RXFC);
> +	rxfc = (ks8851_rdreg16(ks, KS_RXFCTR) >> 8) & 0xff;

The datasheet says:

2. When software driver reads back Receive Frame Count (RXFCTR)
Register; the KSZ8851 will update both Receive Frame Header Status and
Byte Count Registers (RXFHSR/RXFHBCR)

Are you sure there is no side affect here?

    Andrew