netdev - [net-next PATCH 1/2] igb: Fix warning ‘pin’ may be used uninitialized

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Message-ID: <20150305192459.22228.86492.stgit@ahduyck-vm-fedora20>
Date:	Thu, 05 Mar 2015 11:24:59 -0800
From:	Alexander Duyck <alexander.h.duyck@...hat.com>
To:	netdev@...r.kernel.org
Cc:	e1000-devel@...ts.sourceforge.net, jeffrey.t.kirsher@...el.com
Subject: [net-next PATCH 1/2] igb: Fix warning ‘pin’ may
 be used uninitialized

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>
---
 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) {

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