[PATCH net-next 11/13] bnx2x: prevent race in statistics flow
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STALE5451d
SUPERSEDED
From: Dmitry Kravkov <hidden>
Date: 2011-11-10 15:14:45
Subsystem:
broadcom bnx2x 10 gigabit ethernet driver, networking drivers, the rest · Maintainers:
Sudarsana Kalluru, Manish Chopra, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Revision v1 of 3 in this series.
Revisions (3)
- v1 current
- v2 [diff vs current]
- v3 [diff vs current]
The race may cause access of registers while MAC hw block is in reset state. As a result syslog will show error messages. We can prevent this by using state from local variable. Signed-off-by: Dmitry Kravkov <redacted> Signed-off-by: Eilon Greenstein <redacted> --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
index 02ac6a7..3034f0e 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c@@ -1349,12 +1349,14 @@ void bnx2x_stats_handle(struct bnx2x *bp, enum bnx2x_stats_event event) enum bnx2x_stats_state state; if (unlikely(bp->panic)) return; - bnx2x_stats_stm[bp->stats_state][event].action(bp); + 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); + 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", state, event, bp->stats_state);
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1.7.7.2