linux-kernel - Re: [PATCH v3 net-next 3/5] net: dsa: lan9303: Simplify lan9303_xxx_packet

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Date:   Thu, 3 Aug 2017 11:06:35 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Egil Hjelmeland <privat@...l-hjelmeland.no>, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v3 net-next 3/5] net: dsa: lan9303: Simplify
 lan9303_xxx_packet_processing() usage

On 08/03/2017 02:45 AM, Egil Hjelmeland wrote:
> Simplify usage of lan9303_enable_packet_processing,
> lan9303_disable_packet_processing()
> 
> Signed-off-by: Egil Hjelmeland <privat@...l-hjelmeland.no>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

took a little while to figure out that we are utilizing fall through of
the switch/case statement and that's why it's okay.

> ---
>  drivers/net/dsa/lan9303-core.c | 24 ++++++++++--------------
>  1 file changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
> index 126e8b84bdf0..31fe66fbe39a 100644
> --- a/drivers/net/dsa/lan9303-core.c
> +++ b/drivers/net/dsa/lan9303-core.c
> @@ -564,15 +564,16 @@ static int lan9303_handle_reset(struct lan9303 *chip)
>  /* stop processing packets for all ports */
>  static int lan9303_disable_processing(struct lan9303 *chip)
>  {
> -	int ret;
> +	int p;
>  
> -	ret = lan9303_disable_packet_processing(chip, 0);
> -	if (ret)
> -		return ret;
> -	ret = lan9303_disable_packet_processing(chip, 1);
> -	if (ret)
> -		return ret;
> -	return lan9303_disable_packet_processing(chip, 2);
> +	for (p = 0; p < LAN9303_NUM_PORTS; p++) {
> +		int ret = lan9303_disable_packet_processing(chip, p);
> +
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
>  }
>  
>  static int lan9303_check_device(struct lan9303 *chip)
> @@ -765,7 +766,6 @@ static int lan9303_port_enable(struct dsa_switch *ds, int port,
>  	/* enable internal packet processing */
>  	switch (port) {
>  	case 1:
> -		return lan9303_enable_packet_processing(chip, port);
>  	case 2:
>  		return lan9303_enable_packet_processing(chip, port);
>  	default:
> @@ -784,13 +784,9 @@ static void lan9303_port_disable(struct dsa_switch *ds, int port,
>  	/* disable internal packet processing */
>  	switch (port) {
>  	case 1:
> -		lan9303_disable_packet_processing(chip, port);
> -		lan9303_phy_write(ds, chip->phy_addr_sel_strap + 1,
> -				  MII_BMCR, BMCR_PDOWN);
> -		break;
>  	case 2:
>  		lan9303_disable_packet_processing(chip, port);
> -		lan9303_phy_write(ds, chip->phy_addr_sel_strap + 2,
> +		lan9303_phy_write(ds, chip->phy_addr_sel_strap + port,
>  				  MII_BMCR, BMCR_PDOWN);
>  		break;
>  	default:
> 


-- 
Florian