ath9k: Check for pci_map_single() errors

pci_map_single() can fail so detect those errors with
pci_dma_mapping_error() and deal with them accordingly.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index 51e058710d17..7a455468823b 100644
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -304,6 +304,15 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
                         bf->bf_buf_addr = pci_map_single(sc->pdev, skb->data,
                                          sc->sc_rxbufsize,
                                          PCI_DMA_FROMDEVICE);
+                        if (unlikely(pci_dma_mapping_error(sc->pdev,
+                                  bf->bf_buf_addr))) {
+                                dev_kfree_skb_any(skb);
+                                bf->bf_mpdu = NULL;
+                                DPRINTF(sc, ATH_DBG_CONFIG,
+                                        "pci_dma_mapping_error() on RX init\n");
+                                error = -ENOMEM;
+                                break;
+                        }
                         bf->bf_dmacontext = bf->bf_buf_addr;
                 }
                 sc->sc_rxlink = NULL;
@@ -589,6 +598,14 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
                 bf->bf_buf_addr = pci_map_single(sc->pdev, requeue_skb->data,
                                          sc->sc_rxbufsize,
                                          PCI_DMA_FROMDEVICE);
+                if (unlikely(pci_dma_mapping_error(sc->pdev,
+                          bf->bf_buf_addr))) {
+                        dev_kfree_skb_any(requeue_skb);
+                        bf->bf_mpdu = NULL;
+                        DPRINTF(sc, ATH_DBG_CONFIG,
+                                "pci_dma_mapping_error() on RX\n");
+                        break;
+                }
                 bf->bf_dmacontext = bf->bf_buf_addr;
 
                 /*