69 lines
2.5 KiB
Diff
69 lines
2.5 KiB
Diff
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The RX buffer poison needs to be refreshed, if we recycle an RX buffer,
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because it might be (partially) overwritten by some DMA operations.
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Cc: stable@kernel.org
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Cc: Francesco Gringoli <francesco.gringoli@ing.unibs.it>
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Signed-off-by: Michael Buesch <mb@bu3sch.de>
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---
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Index: compat-wireless-2009-03-31/drivers/net/wireless/b43/dma.c
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===================================================================
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--- compat-wireless-2009-03-31.orig/drivers/net/wireless/b43/dma.c 2009-04-06 18:52:30.000000000 +0200
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+++ compat-wireless-2009-03-31/drivers/net/wireless/b43/dma.c 2009-04-06 18:53:04.000000000 +0200
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@@ -1503,20 +1503,16 @@ static void dma_rx(struct b43_dmaring *r
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len = le16_to_cpu(rxhdr->frame_len);
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} while (len == 0 && i++ < 5);
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if (unlikely(len == 0)) {
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- /* recycle the descriptor buffer. */
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- sync_descbuffer_for_device(ring, meta->dmaaddr,
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- ring->rx_buffersize);
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- goto drop;
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+ dmaaddr = meta->dmaaddr;
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+ goto drop_recycle_buffer;
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}
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}
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if (unlikely(b43_rx_buffer_is_poisoned(ring, skb))) {
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/* Something went wrong with the DMA.
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* The device did not touch the buffer and did not overwrite the poison. */
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b43dbg(ring->dev->wl, "DMA RX: Dropping poisoned buffer.\n");
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- /* recycle the descriptor buffer. */
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- sync_descbuffer_for_device(ring, meta->dmaaddr,
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- ring->rx_buffersize);
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- goto drop;
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+ dmaaddr = meta->dmaaddr;
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+ goto drop_recycle_buffer;
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}
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if (unlikely(len > ring->rx_buffersize)) {
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/* The data did not fit into one descriptor buffer
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@@ -1530,6 +1526,7 @@ static void dma_rx(struct b43_dmaring *r
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while (1) {
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desc = ops->idx2desc(ring, *slot, &meta);
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/* recycle the descriptor buffer. */
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+ b43_poison_rx_buffer(ring, meta->skb);
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sync_descbuffer_for_device(ring, meta->dmaaddr,
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ring->rx_buffersize);
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*slot = next_slot(ring, *slot);
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@@ -1548,8 +1545,7 @@ static void dma_rx(struct b43_dmaring *r
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err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC);
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if (unlikely(err)) {
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b43dbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer() failed\n");
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- sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize);
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- goto drop;
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+ goto drop_recycle_buffer;
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}
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unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0);
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@@ -1559,6 +1555,11 @@ static void dma_rx(struct b43_dmaring *r
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b43_rx(ring->dev, skb, rxhdr);
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drop:
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return;
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+
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+drop_recycle_buffer:
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+ /* Poison and recycle the RX buffer. */
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+ b43_poison_rx_buffer(ring, skb);
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+ sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize);
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}
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void b43_dma_rx(struct b43_dmaring *ring)
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