[netdrvr acenic] fix RX descriptor memory ordering

71d5090c · Janice M. Girouard · Jeff Garzik · e2effd3d · 71d5090c
Commit 71d5090c authored Jul 14, 2004 by Janice M. Girouard Committed by Jeff Garzik Jul 14, 2004
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drivers/net/acenic.c drivers/net/acenic.c +5 -0

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--- a/drivers/net/acenic.c
+++ b/drivers/net/acenic.c
@@ -2007,6 +2007,11 @@ static void ace_rx_int(struct net_device *dev, u32 rxretprd, u32 rxretcsm)
 		int bd_flags, desc_type, mapsize;
 		u16 csum;

+
+		/* make sure the rx descriptor isn't read before rxretprd */
+		if (idx == rxretcsm) 
+			rmb();
+
 		retdesc = &ap->rx_return_ring[idx];
 		skbidx = retdesc->idx;
 		bd_flags = retdesc->flags;