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| author | Vladislav Zolotarov <vladz@broadcom.com> | 2010-07-21 05:59:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-21 11:11:54 -0700 |
| commit | a13773a53faa28cf79982601b6fc9ddb0ca45f36 (patch) | |
| tree | 1eb2a88545d8ffe742648886b9da48446b6f0eb0 /drivers | |
| parent | 573201f36fd9c7c6d5218cdcd9948cee700b277d (diff) | |
| download | linux-a13773a53faa28cf79982601b6fc9ddb0ca45f36.tar.gz linux-a13773a53faa28cf79982601b6fc9ddb0ca45f36.tar.bz2 linux-a13773a53faa28cf79982601b6fc9ddb0ca45f36.zip | |
bnx2x: Protect a SM state change
Bug fix: Protect the statistics state machine state update with a
spinlock. Otherwise there was a race condition that would cause the
statistics to stay enabled despite the fact that they were disabled in
the LINK_DOWN event handler.
Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/bnx2x.h | 4 | ||||
| -rw-r--r-- | drivers/net/bnx2x_main.c | 11 |
2 files changed, 11 insertions, 4 deletions
diff --git a/drivers/net/bnx2x.h b/drivers/net/bnx2x.h index 8bd23687c530..bb0872a63315 100644 --- a/drivers/net/bnx2x.h +++ b/drivers/net/bnx2x.h @@ -1062,6 +1062,10 @@ struct bnx2x { /* used to synchronize stats collecting */ int stats_state; + + /* used for synchronization of concurrent threads statistics handling */ + spinlock_t stats_lock; + /* used by dmae command loader */ struct dmae_command stats_dmae; int executer_idx; diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c index 57ff5b3bcce6..3dc876ce6e1f 100644 --- a/drivers/net/bnx2x_main.c +++ b/drivers/net/bnx2x_main.c @@ -4849,16 +4849,18 @@ static const struct { static void bnx2x_stats_handle(struct bnx2x *bp, enum bnx2x_stats_event event) { - enum bnx2x_stats_state state = bp->stats_state; + enum bnx2x_stats_state state; if (unlikely(bp->panic)) return; - bnx2x_stats_stm[state][event].action(bp); + /* Protect a state change flow */ + spin_lock_bh(&bp->stats_lock); + state = bp->stats_state; bp->stats_state = bnx2x_stats_stm[state][event].next_state; + spin_unlock_bh(&bp->stats_lock); - /* Make sure the state has been "changed" */ - smp_wmb(); + bnx2x_stats_stm[state][event].action(bp); if ((event != STATS_EVENT_UPDATE) || netif_msg_timer(bp)) DP(BNX2X_MSG_STATS, "state %d -> event %d -> state %d\n", @@ -9908,6 +9910,7 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp) mutex_init(&bp->port.phy_mutex); mutex_init(&bp->fw_mb_mutex); + spin_lock_init(&bp->stats_lock); #ifdef BCM_CNIC mutex_init(&bp->cnic_mutex); #endif |