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Subject[PATCH 3.12 081/175] net: phy: Fix verification of EEE support in phy_init_eee
Date
From: Guenter Roeck <linux@roeck-us.net>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

[ Upstream commit 54da5a8be3c1e924c35480eb44c6e9b275f6444e ]

phy_init_eee uses phy_find_setting(phydev->speed, phydev->duplex)
to find a valid entry in the settings array for the given speed
and duplex value. For full duplex 1000baseT, this will return
the first matching entry, which is the entry for 1000baseKX_Full.

If the phy eee does not support 1000baseKX_Full, this entry will not
match, causing phy_init_eee to fail for no good reason.

Fixes: 9a9c56cb34e6 ("net: phy: fix a bug when verify the EEE support")
Fixes: 3e7077067e80c ("phy: Expand phy speed/duplex settings array")
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/net/phy/phy.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 36c6994436b7..0bc73f2c24ba 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -203,6 +203,25 @@ static inline int phy_find_valid(int idx, u32 features)
}

/**
+ * phy_check_valid - check if there is a valid PHY setting which matches
+ * speed, duplex, and feature mask
+ * @speed: speed to match
+ * @duplex: duplex to match
+ * @features: A mask of the valid settings
+ *
+ * Description: Returns true if there is a valid setting, false otherwise.
+ */
+static inline bool phy_check_valid(int speed, int duplex, u32 features)
+{
+ unsigned int idx;
+
+ idx = phy_find_valid(phy_find_setting(speed, duplex), features);
+
+ return settings[idx].speed == speed && settings[idx].duplex == duplex &&
+ (settings[idx].setting & features);
+}
+
+/**
* phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
* @phydev: the target phy_device struct
*
@@ -1018,7 +1037,7 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
(phydev->interface == PHY_INTERFACE_MODE_RGMII))) {
int eee_lp, eee_cap, eee_adv;
u32 lp, cap, adv;
- int idx, status;
+ int status;

/* Read phy status to properly get the right settings */
status = phy_read_status(phydev);
@@ -1050,8 +1069,7 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)

adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
- idx = phy_find_setting(phydev->speed, phydev->duplex);
- if (!(lp & adv & settings[idx].setting))
+ if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
goto eee_exit;

if (clk_stop_enable) {
--
2.3.0


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