From: Jesse Barnes This patch originally from Greg Banks. Some parts of the tg3 driver depend on PIO writes arriving in order. This patch ensures that in two key places using the new mmiowb macro. This not only prevents bugs (the queues can be corrupted), but is much faster than ensuring ordering using PIO reads (which involve a few round trips to the target bus on some platforms). Arthur has another patch that uses mmiowb in tg3 that he posted earlier as well. Signed-off-by: Greg Banks Signed-off-by: Jesse Barnes Signed-off-by: Andrew Morton --- 25-akpm/drivers/net/tg3.c | 2 ++ 1 files changed, 2 insertions(+) diff -puN drivers/net/tg3.c~use-mmiowb-in-tg3c drivers/net/tg3.c --- 25/drivers/net/tg3.c~use-mmiowb-in-tg3c 2004-10-21 21:20:33.713943024 -0700 +++ 25-akpm/drivers/net/tg3.c 2004-10-21 21:20:33.722941656 -0700 @@ -2729,6 +2729,7 @@ next_pkt_nopost: tw32_rx_mbox(MAILBOX_RCV_JUMBO_PROD_IDX + TG3_64BIT_REG_LOW, sw_idx); } + mmiowb(); return received; } @@ -3176,6 +3177,7 @@ static int tg3_start_xmit(struct sk_buff netif_stop_queue(dev); out_unlock: + mmiowb(); spin_unlock_irqrestore(&tp->tx_lock, flags); dev->trans_start = jiffies; _