[patch] igb: cleanup igb_enable_mas() a bit

[patch] igb: cleanup igb_enable_mas() a bit

[Dan Carpenter]

Static checkers complain about this because we do:

	if (!(connsw & E1000_CONNSW_SERDESD)) {
		...
	} else if (connsw & E1000_CONNSW_SERDESD) {
		...
	} else {
		...
	}

Once you eliminate that E1000_CONNSW_SERDESD is set and not set then
there aren't any other possibilities so the else statement is dead
code.

This function always returns zero so if you delete the "ret_val"
variable, the code is shorter and more clear.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index f366b3b..8dd581f 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1840,11 +1840,10 @@ static s32 igb_enable_mas(struct igb_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
 	u32 connsw;
-	s32 ret_val = 0;
 
 	connsw = rd32(E1000_CONNSW);
-	if (!(hw->phy.media_type = e1000_media_type_copper))
-		return ret_val;
+	if (hw->phy.media_type != e1000_media_type_copper)
+		return 0;
 
 	/* configure for SerDes media detect */
 	if (!(connsw & E1000_CONNSW_SERDESD)) {
@@ -1852,15 +1851,8 @@ static s32 igb_enable_mas(struct igb_adapter *adapter)
 		connsw |= E1000_CONNSW_AUTOSENSE_EN;
 		wr32(E1000_CONNSW, connsw);
 		wrfl();
-	} else if (connsw & E1000_CONNSW_SERDESD) {
-		/* already SerDes, no need to enable anything */
-		return ret_val;
-	} else {
-		netdev_info(adapter->netdev,
-			"MAS: Unable to configure feature, disabling..\n");
-		adapter->flags &= ~IGB_FLAG_MAS_ENABLE;
 	}
-	return ret_val;
+	return 0;
 }
 
 void igb_reset(struct igb_adapter *adapter)

Re: [patch] igb: cleanup igb_enable_mas() a bit

[Jeff Kirsher]

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On Thu, 2015-03-19 at 16:31 +0300, Dan Carpenter wrote:
> Static checkers complain about this because we do:
> 
>         if (!(connsw & E1000_CONNSW_SERDESD)) {
>                 ...
>         } else if (connsw & E1000_CONNSW_SERDESD) {
>                 ...
>         } else {
>                 ...
>         }
> 
> Once you eliminate that E1000_CONNSW_SERDESD is set and not set then
> there aren't any other possibilities so the else statement is dead
> code.
> 
> This function always returns zero so if you delete the "ret_val"
> variable, the code is shorter and more clear.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Thanks Dan, surprised we did not see this earlier.  I have added your
patch to my queue.
-- 
git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue.git
dev-queue

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