From 73e6cdcf479ce3a8d33a726f0477473db35a4b2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20B=C3=BCsch?= <m@bues.ch>
Date: Mon, 4 Jul 2011 19:51:11 +0200
Subject: [PATCH] b43: Add RX side DMA memory barrier

This adds a memory barrier to ensure the writes to the ring memory
are committed before the DMA ring pointer is updated.
We do a similar thing on the TX side already.

Signed-off-by: Michael Buesch <m@bues.ch>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
 drivers/net/wireless/b43/dma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index d02cf8300e3e..7a09a467339c 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -1600,6 +1600,7 @@ void b43_dma_rx(struct b43_dmaring *ring)
 		dma_rx(ring, &slot);
 		update_max_used_slots(ring, ++used_slots);
 	}
+	wmb();
 	ops->set_current_rxslot(ring, slot);
 	ring->current_slot = slot;
 }
-- 
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