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>
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index d02cf83..7a09a46 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -1600,6 +1600,7 @@
dma_rx(ring, &slot);
update_max_used_slots(ring, ++used_slots);
}
+ wmb();
ops->set_current_rxslot(ring, slot);
ring->current_slot = slot;
}