From 4b65246b427152fc7e8e1f673d3f0dc7582a89af Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Tue, 22 Nov 2016 13:55:31 -0800 Subject: ethtool: Protect {get, set}_phy_tunable with PHY device mutex PHY drivers should be able to rely on the caller of {get,set}_tunable to have acquired the PHY device mutex, in order to both serialize against concurrent calls of these functions, but also against PHY state machine changes. All ethtool PHY-level functions do this, except {get,set}_tunable, so we make them consistent here as well. We need to update the Microsemi PHY driver in the same commit to avoid introducing either deadlocks, or lack of proper locking. Fixes: 968ad9da7e0e ("ethtool: Implements ETHTOOL_PHY_GTUNABLE/ETHTOOL_PHY_STUNABLE") Fixes: 310d9ad57ae0 ("net: phy: Add downshift get/set support in Microsemi PHYs driver") Signed-off-by: Florian Fainelli Reviewed-by: Andrew Lunn Reviewed-by: Allan W. Nielsen Signed-off-by: David S. Miller --- net/core/ethtool.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'net/core/ethtool.c') diff --git a/net/core/ethtool.c b/net/core/ethtool.c index e9b4556751ff..0adb3bec5b5a 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -2466,7 +2466,9 @@ static int get_phy_tunable(struct net_device *dev, void __user *useraddr) data = kmalloc(tuna.len, GFP_USER); if (!data) return -ENOMEM; + mutex_lock(&phydev->lock); ret = phydev->drv->get_tunable(phydev, &tuna, data); + mutex_unlock(&phydev->lock); if (ret) goto out; useraddr += sizeof(tuna); @@ -2501,7 +2503,9 @@ static int set_phy_tunable(struct net_device *dev, void __user *useraddr) ret = -EFAULT; if (copy_from_user(data, useraddr, tuna.len)) goto out; + mutex_lock(&phydev->lock); ret = phydev->drv->set_tunable(phydev, &tuna, data); + mutex_unlock(&phydev->lock); out: kfree(data); -- cgit v1.2.3