This adds messages for some DMA mapping failures.
These are useful for debugging DMA address problems, as they appear
on x86_64 machines with IOMMU enabled.
Signed-off-by: Michael Buesch <mb@xxxxxxxxx>
---
Please queue for 2.6.25
Index: wireless-testing/drivers/net/wireless/b43/dma.c
===================================================================
--- wireless-testing.orig/drivers/net/wireless/b43/dma.c 2008-03-28 11:33:52.000000000 +0100
+++ wireless-testing/drivers/net/wireless/b43/dma.c 2008-03-28 11:34:12.000000000 +0100
@@ -571,12 +571,13 @@ static int setup_rx_descbuffer(struct b4
return -ENOMEM;
dmaaddr = map_descbuffer(ring, skb->data,
ring->rx_buffersize, 0);
}
if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
+ b43err(ring->dev->wl, "RX DMA buffer allocation failed\n");
dev_kfree_skb_any(skb);
return -EIO;
}
meta->skb = skb;
meta->dmaaddr = dmaaddr;
@@ -826,14 +827,18 @@ struct b43_dmaring *b43_setup_dmaring(st
dma_test = dma_map_single(dev->dev->dev,
ring->txhdr_cache,
b43_txhdr_size(dev),
DMA_TO_DEVICE);
if (b43_dma_mapping_error(ring, dma_test,
- b43_txhdr_size(dev), 1))
+ b43_txhdr_size(dev), 1)) {
+
+ b43err(dev->wl,
+ "TXHDR DMA allocation failed\n");
goto err_kfree_txhdr_cache;
+ }
}
dma_unmap_single(dev->dev->dev,
dma_test, b43_txhdr_size(dev),
DMA_TO_DEVICE);
}
--
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