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>
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c
index 5cf8311..17fd05e 100644
--- a/drivers/net/wireless/ath9k/xmit.c
+++ b/drivers/net/wireless/ath9k/xmit.c
@@ -1642,7 +1642,7 @@
}
}
-static void ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf,
+static int ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf,
struct sk_buff *skb,
struct ath_tx_control *txctl)
{
@@ -1701,9 +1701,18 @@
/* DMA setup */
bf->bf_mpdu = skb;
+
bf->bf_dmacontext = pci_map_single(sc->pdev, skb->data,
skb->len, PCI_DMA_TODEVICE);
+ if (unlikely(pci_dma_mapping_error(sc->pdev, bf->bf_dmacontext))) {
+ bf->bf_mpdu = NULL;
+ DPRINTF(sc, ATH_DBG_CONFIG,
+ "pci_dma_mapping_error() on TX\n");
+ return -ENOMEM;
+ }
+
bf->bf_buf_addr = bf->bf_dmacontext;
+ return 0;
}
/* FIXME: tx power */
@@ -1775,10 +1784,12 @@
spin_unlock_bh(&txctl->txq->axq_lock);
}
+/* Upon failure caller should free skb */
int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb,
struct ath_tx_control *txctl)
{
struct ath_buf *bf;
+ int r;
/* Check if a tx buffer is available */
@@ -1788,7 +1799,15 @@
return -1;
}
- ath_tx_setup_buffer(sc, bf, skb, txctl);
+ r = ath_tx_setup_buffer(sc, bf, skb, txctl);
+ if (unlikely(r)) {
+ spin_lock_bh(&sc->sc_txbuflock);
+ DPRINTF(sc, ATH_DBG_FATAL, "TX mem alloc failure\n");
+ list_add_tail(&bf->list, &sc->sc_txbuf);
+ spin_unlock_bh(&sc->sc_txbuflock);
+ return r;
+ }
+
ath_tx_start_dma(sc, bf, txctl);
return 0;