b43: Add DMA mapping failure messages

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@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index cfbc1a2..948eb1f 100644 (file)
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -619,6 +619,7 @@ static int setup_rx_descbuffer(struct b43_dmaring *ring,
        }
 
        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;
        }
@@ -874,8 +875,12 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *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,