Re: [PATCH] tg3:Add error handling to the function tg3_test_loopback

[Michael Chan <mchan@broadcom.com>]

On Thu, 2015-07-16 at 14:51 -0400, Nicholas Krause wrote: 
> This adds proper error handling for if the calls to the function
> tg3_phy_lpbk_set fail by returning -EIO by assigning the return
> value to the variable err and if it equals anything other then
> zero jumps to the goto label done as no other work can be handled
> internally in the function tg3_test_loopback.
> 
> Signed-off-by: Nicholas Krause <xerofoify@gmail.com>

Acked-by: Michael Chan <mchan@broadcom.com>

> ---
>  drivers/net/ethernet/broadcom/tg3.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> index 73c934c..8584cb7 100644
> --- a/drivers/net/ethernet/broadcom/tg3.c
> +++ b/drivers/net/ethernet/broadcom/tg3.c
> @@ -13625,8 +13625,10 @@ static int tg3_test_loopback(struct tg3 *tp, u64 *data, bool do_extlpbk)
>  	    !tg3_flag(tp, USE_PHYLIB)) {
>  		int i;
>  
> -		tg3_phy_lpbk_set(tp, 0, false);
> -
> +		err = tg3_phy_lpbk_set(tp, 0, false);
> +			if (err)
> +				goto done;
> +
>  		/* Wait for link */
>  		for (i = 0; i < 100; i++) {
>  			if (tr32(MAC_TX_STATUS) & TX_STATUS_LINK_UP)
> @@ -13644,8 +13646,10 @@ static int tg3_test_loopback(struct tg3 *tp, u64 *data, bool do_extlpbk)
>  			data[TG3_PHY_LOOPB_TEST] |= TG3_JMB_LOOPBACK_FAILED;
>  
>  		if (do_extlpbk) {
> -			tg3_phy_lpbk_set(tp, 0, true);
> -
> +			err = tg3_phy_lpbk_set(tp, 0, true);
> +
> +				if (err)
> +					goto done;
>  			/* All link indications report up, but the hardware
>  			 * isn't really ready for about 20 msec.  Double it
>  			 * to be sure.