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bnx2: Fix compiler warning in bnx2_disable_forced_2g5().

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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 <prarit@redhat.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2010-06-08 07:21:30 +00:00 committed by David S. Miller
parent fc0ba8e871
commit cbd6890c59
1 changed files with 28 additions and 15 deletions
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43
drivers/net/bnx2.c
View file

@ -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);