linux-kernel - Re: [PATCH] net: macb: Fix build warning

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Date:	Wed, 11 Dec 2013 09:07:44 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>,
	David Miller <davem@...emloft.net>
CC:	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	"kbuild test robot" <fengguang.wu@...el.com>
Subject: Re: [PATCH] net: macb: Fix build warning

On 11/12/2013 05:57, Soren Brinkmann :
> When adjusting the link speed, the target frequency is determined by a
> 'swith (LINK_SPEED)' statement, that assigns the target rate only for
> valid and expected LINK_SPEED values. This incomplete switch statement
> leads to the following build warning:
>       drivers/net/ethernet/cadence/macb.c: In function 'macb_handle_link_change':
>    >> drivers/net/ethernet/cadence/macb.c:241:14: warning: 'rate' may be used uninitialized in this function [-Wmaybe-uninitialized]
>          netdev_warn(dev, "unable to generate target frequency: %ld Hz\n",
>                     ^
>       drivers/net/ethernet/cadence/macb.c:215:13: note: 'rate' was declared here
>         long ferr, rate, rate_rounded;
>
> Fixing this by bailing out of that function in the switch's default case
> before the rate variable is used.
>
> Reported-by: kbuild test robot <fengguang.wu@...el.com>
> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>

> ---
>   drivers/net/ethernet/cadence/macb.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index 419529a9309d..3190d38e16fb 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -225,7 +225,7 @@ static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
>   		rate = 125000000;
>   		break;
>   	default:
> -		break;
> +		return;
>   	}
>
>   	rate_rounded = clk_round_rate(clk, rate);
>


-- 
Nicolas Ferre
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