53 lines
1.8 KiB
Diff
53 lines
1.8 KiB
Diff
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From: Russell King <rmk+kernel@armlinux.org.uk>
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Date: Wed, 4 Jan 2017 21:00:51 +0000
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Subject: [PATCH] net: phy: avoid setting unsupported EEE advertisments
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We currently allow userspace to set any EEE advertisments it desires,
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whether or not the PHY supports them. For example:
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# ethtool --set-eee eth1 advertise 0xffffffff
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# ethtool --show-eee eth1
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EEE Settings for eth1:
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EEE status: disabled
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Tx LPI: disabled
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Supported EEE link modes: 100baseT/Full
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1000baseT/Full
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10000baseT/Full
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Advertised EEE link modes: 100baseT/Full
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1000baseT/Full
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1000baseKX/Full
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10000baseT/Full
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10000baseKX4/Full
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10000baseKR/Full
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Clearly, this is not sane, we should only allow link modes that are
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supported to be advertised (as we do elsewhere.) Ensure that we mask
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the MDIO_AN_EEE_ADV value with the capabilities retrieved from the
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MDIO_PCS_EEE_ABLE register.
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Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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---
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--- a/drivers/net/phy/phy.c
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+++ b/drivers/net/phy/phy.c
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@@ -1307,11 +1307,16 @@ EXPORT_SYMBOL(phy_ethtool_get_eee);
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*/
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int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
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{
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- int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
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+ int cap, adv;
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- phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, val);
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+ /* Get Supported EEE */
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+ cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
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+ if (cap < 0)
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+ return cap;
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- return 0;
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+ adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
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+
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+ return phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
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}
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EXPORT_SYMBOL(phy_ethtool_set_eee);
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