* [PATCH] b43: Add RX side DMA memory barrier
@ 2011-07-04 17:51 Michael Büsch
0 siblings, 0 replies; only message in thread
From: Michael Büsch @ 2011-07-04 17:51 UTC (permalink / raw)
To: b43-dev
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>
---
There's no bug report or known breakage (as far as I know) on this,
so no CC to stable.
Index: linux-2.6.39/drivers/net/wireless/b43/dma.c
===================================================================
--- linux-2.6.39.orig/drivers/net/wireless/b43/dma.c 2011-05-19 06:06:34.000000000 +0200
+++ linux-2.6.39/drivers/net/wireless/b43/dma.c 2011-07-04 17:24:56.327210182 +0200
@@ -1599,6 +1599,7 @@ 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;
}
--
Greetings, Michael.
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2011-07-04 17:51 [PATCH] b43: Add RX side DMA memory barrier Michael Büsch
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