netdev - [net-next 3/6] igb: Fix warning pin may be used uninitialized

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Date:	Fri,  6 Mar 2015 03:06:03 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Alexander Duyck <alexander.h.duyck@...hat.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 3/6] igb: Fix warning pin may be used uninitialized

From: Alexander Duyck <alexander.h.duyck@...hat.com>

When building the kernel using the gcc 4.8.3 compiler included in Fedora 20
I was repeatedly seeing the warning:

 drivers/net/ethernet/intel/igb/igb_ptp.c: In function ‘igb_ptp_feature_enable_i210’:
 drivers/net/ethernet/intel/igb/igb_ptp.c:395:21: warning: ‘pin’ may be used uninitialized in this function
 [-Wmaybe-uninitialized]
   tssdp &= ~ts_sdp_en[pin];
                     ^
 drivers/net/ethernet/intel/igb/igb_ptp.c:471:6: note: ‘pin’ was declared here
   int pin;
       ^

To resolve it I am assigning the pin a value of -1 when it is instantiated.

Signed-off-by: Alexander Duyck <alexander.h.duyck@...hat.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/igb/igb_ptp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index d20fc8e..525e5c4 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -468,7 +468,7 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
 	u32 tsauxc, tsim, tsauxc_mask, tsim_mask, trgttiml, trgttimh;
 	unsigned long flags;
 	struct timespec ts;
-	int pin;
+	int pin = -1;
 	s64 ns;
 
 	switch (rq->type) {
-- 
1.9.3

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