diff options
| author | Andrew Lunn <andrew@lunn.ch> | 2016-02-20 02:35:29 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-20 07:41:37 +0300 |
| commit | 321b4d4bd12f90e7497c9ab057aafcc2649aa902 (patch) | |
| tree | 303d777fcba3f7aedecce0b5d3c059f2997e9229 /drivers/net/phy | |
| parent | 2f86017748d96723372864c597d08d11c09dd759 (diff) | |
| download | linux-321b4d4bd12f90e7497c9ab057aafcc2649aa902.tar.xz | |
phy: marvell/micrel: Fix Unpossible condition
commit 2b2427d06426 ("phy: micrel: Add ethtool statistics counters")
from Dec 30, 2015, leads to the following static checker
warning:
drivers/net/phy/micrel.c:609 kszphy_get_stat()
warn: unsigned 'val' is never less than zero.
drivers/net/phy/micrel.c
602 static u64 kszphy_get_stat(struct phy_device *phydev, int i)
603 {
604 struct kszphy_hw_stat stat = kszphy_hw_stats[i];
605 struct kszphy_priv *priv = phydev->priv;
606 u64 val;
607
608 val = phy_read(phydev, stat.reg);
609 if (val < 0) {
^^^^^^^
Unpossible!
610 val = UINT64_MAX;
611 } else {
612 val = val & ((1 << stat.bits) - 1);
613 priv->stats[i] += val;
614 val = priv->stats[i];
615 }
616
617 return val;
618 }
The same problem exists in the Marvell driver. Fix both.
Fixes: 2b2427d06426 ("phy: micrel: Add ethtool statistics counters")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: Julia.Lawall <julia.lawall@lip6.fr>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy')
| -rw-r--r-- | drivers/net/phy/marvell.c | 10 | ||||
| -rw-r--r-- | drivers/net/phy/micrel.c | 9 |
2 files changed, 10 insertions, 9 deletions
diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c index 1dcbd3ff9e38..d0168f1a1bf0 100644 --- a/drivers/net/phy/marvell.c +++ b/drivers/net/phy/marvell.c @@ -1065,8 +1065,8 @@ static u64 marvell_get_stat(struct phy_device *phydev, int i) { struct marvell_hw_stat stat = marvell_hw_stats[i]; struct marvell_priv *priv = phydev->priv; - int err, oldpage; - u64 val; + int err, oldpage, val; + u64 ret; oldpage = phy_read(phydev, MII_MARVELL_PHY_PAGE); err = phy_write(phydev, MII_MARVELL_PHY_PAGE, @@ -1076,16 +1076,16 @@ static u64 marvell_get_stat(struct phy_device *phydev, int i) val = phy_read(phydev, stat.reg); if (val < 0) { - val = UINT64_MAX; + ret = UINT64_MAX; } else { val = val & ((1 << stat.bits) - 1); priv->stats[i] += val; - val = priv->stats[i]; + ret = priv->stats[i]; } phy_write(phydev, MII_MARVELL_PHY_PAGE, oldpage); - return val; + return ret; } static void marvell_get_stats(struct phy_device *phydev, diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index 03833dbfca67..48219c83fb00 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -612,18 +612,19 @@ static u64 kszphy_get_stat(struct phy_device *phydev, int i) { struct kszphy_hw_stat stat = kszphy_hw_stats[i]; struct kszphy_priv *priv = phydev->priv; - u64 val; + int val; + u64 ret; val = phy_read(phydev, stat.reg); if (val < 0) { - val = UINT64_MAX; + ret = UINT64_MAX; } else { val = val & ((1 << stat.bits) - 1); priv->stats[i] += val; - val = priv->stats[i]; + ret = priv->stats[i]; } - return val; + return ret; } static void kszphy_get_stats(struct phy_device *phydev, |