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b43: Add RX side DMA memory barrier

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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>
This commit is contained in:
Michael Büsch 2011-07-04 19:51:11 +02:00 committed by John W. Linville
parent 14205aa21c
commit 73e6cdcf47
1 changed files with 1 additions and 0 deletions
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drivers/net/wireless/b43/dma.c
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@ -1600,6 +1600,7 @@ void b43_dma_rx(struct b43_dmaring *ring)
dma_rx(ring, &slot); dma_rx(ring, &slot);
update_max_used_slots(ring, ++used_slots); update_max_used_slots(ring, ++used_slots);
} }
wmb();
ops->set_current_rxslot(ring, slot); ops->set_current_rxslot(ring, slot);
ring->current_slot = slot; ring->current_slot = slot;
} }