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Date: Tue, 9 Mar 2010 17:55:01 +0100 From: Stanislaw Gruszka <sgruszka@...hat.com> To: netdev@...r.kernel.org Cc: Vladislav Zolotarov <vladz@...adcom.com>, Eilon Greenstein <eilong@...adcom.com>, Michael Chan <mchan@...adcom.com>, Stanislaw Gruszka <sgruszka@...hat.com> Subject: [PATCH 2/4] bnx2x: remove not necessary compiler barrier Access to fp->tx_bd_prod is protected by __netif_tx_lock, so we do not need any barrier for that. Update of fp->tx_bd_cons in bnx2x_tx_int() is not protected by lock, but barrier() nor smb_mb() in bnx2x_tx_avail() not guarantee we will see values that is written on other cpu. Ordering issues between netif_tx_stop_queue(), netif_tx_queue_stopped(), fp->tx_bd_cons = bd_cons and bnx2x_tx_avail() are already handled by smp_mb() in bnx2x_tx_int() and bnx2x_start_xmit(). Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com> --- drivers/net/bnx2x_main.c | 1 - 1 files changed, 0 insertions(+), 1 deletions(-) diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c index 9fc0f6a..ae62b67 100644 --- a/drivers/net/bnx2x_main.c +++ b/drivers/net/bnx2x_main.c @@ -893,7 +893,6 @@ static inline u16 bnx2x_tx_avail(struct bnx2x_fastpath *fp) u16 prod; u16 cons; - barrier(); /* Tell compiler that prod and cons can change */ prod = fp->tx_bd_prod; cons = fp->tx_bd_cons; -- 1.6.2.5 -- 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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