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>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index cfbc1a26f601..948eb1fe916b 100644
--- 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,