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tg3: Restrict phy ioctl access 

If management firmware is present and the device is down, the firmware
will assume control of the phy.  If a phy access were allowed from the
host, it will collide with firmware phy accesses, resulting in
unpredictable behavior.  This patch fixes the problem by disallowing phy
accesses during the problematic condition.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2011-02-15 12:51:10 +00:00 committed by David S. Miller
parent 0d672e9f8a
commit ed199facd0
1 changed files with 6 additions and 2 deletions
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8
drivers/net/tg3.c
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@ -11158,7 +11158,9 @@ static int tg3_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
if (tp->phy_flags & TG3_PHYFLG_PHY_SERDES)
break; /* We have no PHY */
if (tp->phy_flags & TG3_PHYFLG_IS_LOW_POWER)
if ((tp->phy_flags & TG3_PHYFLG_IS_LOW_POWER) ||
((tp->tg3_flags & TG3_FLAG_ENABLE_ASF) &&
!netif_running(dev)))
return -EAGAIN;
spin_lock_bh(&tp->lock);
@ -11174,7 +11176,9 @@ static int tg3_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
if (tp->phy_flags & TG3_PHYFLG_PHY_SERDES)
break; /* We have no PHY */
if (tp->phy_flags & TG3_PHYFLG_IS_LOW_POWER)
if ((tp->phy_flags & TG3_PHYFLG_IS_LOW_POWER) ||
((tp->tg3_flags & TG3_FLAG_ENABLE_ASF) &&
!netif_running(dev)))
return -EAGAIN;
spin_lock_bh(&tp->lock);