Skip to contentSkip to conversation

bnx2: Fix compiler warning in bnx2_disable_forced_2g5().

PATCH Applied Michael Chan 2 participants 2 messages Jun 8, 2010 – Jun 12, 2010

Subsystems (2)
Networking Network drivers
lore
Share & tools
lore

Michael Chan

author
#0 lore raw

PATCH 1/1 bnx2: Fix compiler warning in bnx2_disable_forced_2g5().

drivers/net/bnx2.c: In function 'bnx2_disable_forced_2g5':
drivers/net/bnx2.c:1489: warning: 'bmcr' may be used uninitialized in this function

We fix it by checking return values from all bnx2_read_phy() and proceeding to do read-modify-write only if the read operation is successful.

The related bnx2_enable_forced_2g5() is also fixed the same way.

Reported-by Prarit Bhargava <[email protected]>
Signed-off-by Michael Chan <[email protected]>
---
 drivers/net/bnx2.c |   43 ++++++++++++++++++++++++++++---------------
 1 files changed, 28 insertions(+), 15 deletions(-)
drivers/net/bnx2.c +28 -15
index 949d7a9..522de9f 100644
@@ -1446,7 +1446,8 @@ bnx2_test_and_disable_2g5(struct bnx2 *bp)
 static void
 bnx2_enable_forced_2g5(struct bnx2 *bp)
 {
-	u32 bmcr;
+	u32 uninitialized_var(bmcr);
+	int err;
 
 	if (!(bp->phy_flags & BNX2_PHY_FLAG_2_5G_CAPABLE))
 		return;

@@ -1456,22 +1457,28 @@ bnx2_enable_forced_2g5(struct bnx2 *bp)
 
 		bnx2_write_phy(bp, MII_BNX2_BLK_ADDR,
 			       MII_BNX2_BLK_ADDR_SERDES_DIG);
-		bnx2_read_phy(bp, MII_BNX2_SERDES_DIG_MISC1, &val);
-		val &= ~MII_BNX2_SD_MISC1_FORCE_MSK;
-		val |= MII_BNX2_SD_MISC1_FORCE | MII_BNX2_SD_MISC1_FORCE_2_5G;
-		bnx2_write_phy(bp, MII_BNX2_SERDES_DIG_MISC1, val);
+		if (!bnx2_read_phy(bp, MII_BNX2_SERDES_DIG_MISC1, &val)) {
+			val &= ~MII_BNX2_SD_MISC1_FORCE_MSK;
+			val |= MII_BNX2_SD_MISC1_FORCE |
+				MII_BNX2_SD_MISC1_FORCE_2_5G;
+			bnx2_write_phy(bp, MII_BNX2_SERDES_DIG_MISC1, val);
+		}
 
 		bnx2_write_phy(bp, MII_BNX2_BLK_ADDR,
 			       MII_BNX2_BLK_ADDR_COMBO_IEEEB0);
-		bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
+		err = bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
 
 	} else if (CHIP_NUM(bp) == CHIP_NUM_5708) {
-		bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
-		bmcr |= BCM5708S_BMCR_FORCE_2500;
+		err = bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
+		if (!err)
+			bmcr |= BCM5708S_BMCR_FORCE_2500;
 	} else {
 		return;
 	}
 
+	if (err)
+		return;
+
 	if (bp->autoneg & AUTONEG_SPEED) {
 		bmcr &= ~BMCR_ANENABLE;
 		if (bp->req_duplex == DUPLEX_FULL)

@@ -1483,7 +1490,8 @@ bnx2_enable_forced_2g5(struct bnx2 *bp)
 static void
 bnx2_disable_forced_2g5(struct bnx2 *bp)
 {
-	u32 bmcr;
+	u32 uninitialized_var(bmcr);
+	int err;
 
 	if (!(bp->phy_flags & BNX2_PHY_FLAG_2_5G_CAPABLE))
 		return;

@@ -1493,21 +1501,26 @@ bnx2_disable_forced_2g5(struct bnx2 *bp)
 
 		bnx2_write_phy(bp, MII_BNX2_BLK_ADDR,
 			       MII_BNX2_BLK_ADDR_SERDES_DIG);
-		bnx2_read_phy(bp, MII_BNX2_SERDES_DIG_MISC1, &val);
-		val &= ~MII_BNX2_SD_MISC1_FORCE;
-		bnx2_write_phy(bp, MII_BNX2_SERDES_DIG_MISC1, val);
+		if (!bnx2_read_phy(bp, MII_BNX2_SERDES_DIG_MISC1, &val)) {
+			val &= ~MII_BNX2_SD_MISC1_FORCE;
+			bnx2_write_phy(bp, MII_BNX2_SERDES_DIG_MISC1, val);
+		}
 
 		bnx2_write_phy(bp, MII_BNX2_BLK_ADDR,
 			       MII_BNX2_BLK_ADDR_COMBO_IEEEB0);
-		bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
+		err = bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
 
 	} else if (CHIP_NUM(bp) == CHIP_NUM_5708) {
-		bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
-		bmcr &= ~BCM5708S_BMCR_FORCE_2500;
+		err = bnx2_read_phy(bp, bp->mii_bmcr, &bmcr);
+		if (!err)
+			bmcr &= ~BCM5708S_BMCR_FORCE_2500;
 	} else {
 		return;
 	}
 
+	if (err)
+		return;
+
 	if (bp->autoneg & AUTONEG_SPEED)
 		bmcr |= BMCR_SPEED1000 | BMCR_ANENABLE | BMCR_ANRESTART;
 	bnx2_write_phy(bp, bp->mii_bmcr, bmcr);
Signature · 1 line
1.6.4.GIT
maintainer Applied
#1 lore raw

From: "Michael Chan" <[email protected]>
Date: Tue, 8 Jun 2010 10:21:30 -0700

Quoted 10 lines

drivers/net/bnx2.c: In function 'bnx2_disable_forced_2g5':
drivers/net/bnx2.c:1489: warning: 'bmcr' may be used uninitialized in this function

We fix it by checking return values from all bnx2_read_phy() and proceeding to do read-modify-write only if the read operation is successful.

The related bnx2_enable_forced_2g5() is also fixed the same way.

Reported-by Prarit Bhargava <[email protected]>
Signed-off-by Michael Chan <[email protected]>

Applied to net-next-2.6, thanks.