From: Soren Brinkmann <soren.brinkmann@xilinx.com>
Date: Wed, 11 Dec 2013 04:57:57 +0000 (-0800)
Subject: net: macb: Fix build warning
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=9319e47c18c41f2748c4140b0ac32097a56f36c1;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

net: macb: Fix build warning

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@intel.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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);