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[TG3]: Fix irq_sync race condition.

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Gagan Arneja <gaagaan@gmail.com> pointed out that tg3_reset_task()
could potentially race with another thread calling tg3_full_lock()
such as the ethtool_set_xxx() functions.  This may trigger the
BUG_ON() in tg3_irq_quiesce() or cause the irq_sync flag to be out-
of-sync.

I think the easiest way to fix this is to get the tp->lock first
before setting the irq_sync flag.  This is safe to do because the
tp->lock is never grabbed by the irq handler.  This change will
guarantee that the irq_sync flag updates will be serialized.  We also
have to change one spot to call tg3_netif_start() (which clears the
irq_sync flag) before releasing the tp->lock.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2007-07-11 19:47:19 -07:00 committed by David S. Miller
parent db3d99c090
commit 469665459d
1 changed files with 3 additions and 3 deletions
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6
drivers/net/tg3.c
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@ -3512,9 +3512,9 @@ static inline int tg3_irq_sync(struct tg3 *tp)
*/
static inline void tg3_full_lock(struct tg3 *tp, int irq_sync)
{
spin_lock_bh(&tp->lock);
if (irq_sync)
tg3_irq_quiesce(tp);
spin_lock_bh(&tp->lock);
}
static inline void tg3_full_unlock(struct tg3 *tp)
@ -9116,10 +9116,10 @@ static void tg3_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
/* Update RX_MODE_KEEP_VLAN_TAG bit in RX_MODE register. */
__tg3_set_rx_mode(dev);
tg3_full_unlock(tp);
if (netif_running(dev))
tg3_netif_start(tp);
tg3_full_unlock(tp);
}
#endif