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authorMichael Buesch <mb@bu3sch.de>2009-03-28 00:41:25 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-04-16 10:39:03 -0400
commitcf68636a9773aa97915497fe54fa4a51e3f08f3a (patch)
tree8280b54bdceffc726a9b9f4cdff395a95998a302 /drivers/net
parentec9a1d8c13e36440eda0f3c79b8149080e3ab5ba (diff)
b43: Refresh RX poison on buffer recycling
The RX buffer poison needs to be refreshed, if we recycle an RX buffer, because it might be (partially) overwritten by some DMA operations. Cc: stable@kernel.org Cc: Francesco Gringoli <francesco.gringoli@ing.unibs.it> Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/b43/dma.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index dfa6c72c3bd..eae680b5305 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -1503,20 +1503,16 @@ static void dma_rx(struct b43_dmaring *ring, int *slot)
len = le16_to_cpu(rxhdr->frame_len);
} while (len == 0 && i++ < 5);
if (unlikely(len == 0)) {
- /* recycle the descriptor buffer. */
- sync_descbuffer_for_device(ring, meta->dmaaddr,
- ring->rx_buffersize);
- goto drop;
+ dmaaddr = meta->dmaaddr;
+ goto drop_recycle_buffer;
}
}
if (unlikely(b43_rx_buffer_is_poisoned(ring, skb))) {
/* Something went wrong with the DMA.
* The device did not touch the buffer and did not overwrite the poison. */
b43dbg(ring->dev->wl, "DMA RX: Dropping poisoned buffer.\n");
- /* recycle the descriptor buffer. */
- sync_descbuffer_for_device(ring, meta->dmaaddr,
- ring->rx_buffersize);
- goto drop;
+ dmaaddr = meta->dmaaddr;
+ goto drop_recycle_buffer;
}
if (unlikely(len > ring->rx_buffersize)) {
/* The data did not fit into one descriptor buffer
@@ -1530,6 +1526,7 @@ static void dma_rx(struct b43_dmaring *ring, int *slot)
while (1) {
desc = ops->idx2desc(ring, *slot, &meta);
/* recycle the descriptor buffer. */
+ b43_poison_rx_buffer(ring, meta->skb);
sync_descbuffer_for_device(ring, meta->dmaaddr,
ring->rx_buffersize);
*slot = next_slot(ring, *slot);
@@ -1548,8 +1545,7 @@ static void dma_rx(struct b43_dmaring *ring, int *slot)
err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC);
if (unlikely(err)) {
b43dbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer() failed\n");
- sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize);
- goto drop;
+ goto drop_recycle_buffer;
}
unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0);
@@ -1559,6 +1555,11 @@ static void dma_rx(struct b43_dmaring *ring, int *slot)
b43_rx(ring->dev, skb, rxhdr);
drop:
return;
+
+drop_recycle_buffer:
+ /* Poison and recycle the RX buffer. */
+ b43_poison_rx_buffer(ring, skb);
+ sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize);
}
void b43_dma_rx(struct b43_dmaring *ring)