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Message-ID: <1184196705.5211.8.camel@dell> Date: Wed, 11 Jul 2007 16:31:45 -0700 From: "Michael Chan" <mchan@...adcom.com> To: davem@...emloft.net, mcarlson@...adcom.com, netdev@...r.kernel.org cc: gaagaan@...il.com Subject: [1/5][TG3]: Fix irq_sync race condition. [TG3]: Fix irq_sync race condition. Gagan Arneja <gaagaan@...il.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@...adcom.com> diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index 3a43426..314f5cf 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -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 - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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