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@xxxxxxxxxxx>
---
drivers/net/wireless/ath9k/beacon.c | 16 +++++++++++++++-
drivers/net/wireless/ath9k/recv.c | 17 +++++++++++++++++
drivers/net/wireless/ath9k/xmit.c | 23 +++++++++++++++++++++--
3 files changed, 53 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/ath9k/beacon.c b/drivers/net/wireless/ath9k/beacon.c
index e80d9b9..bc75f64 100644
--- a/drivers/net/wireless/ath9k/beacon.c
+++ b/drivers/net/wireless/ath9k/beacon.c
@@ -192,6 +192,13 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
pci_map_single(sc->pdev, skb->data,
skb->len,
PCI_DMA_TODEVICE);
+ 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 beaconing\n");
+ return NULL;
+ }
skb = ieee80211_get_buffered_bc(sc->hw, vif);
@@ -396,11 +403,18 @@ int ath_beacon_alloc(struct ath_softc *sc, int if_id)
memcpy(&hdr[1], &val, sizeof(val));
}
+ bf->bf_mpdu = skb;
bf->bf_buf_addr = bf->bf_dmacontext =
pci_map_single(sc->pdev, skb->data,
skb->len,
PCI_DMA_TODEVICE);
- bf->bf_mpdu = skb;
+ 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 beacon alloc\n");
+ return -ENOMEM;
+ }
return 0;
}
diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index ba6194a..35ab3bb 100644
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -309,6 +309,15 @@ 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;
@@ -594,6 +603,14 @@ 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;
/*
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c
index 413fbdd..ef209b5 100644
--- a/drivers/net/wireless/ath9k/xmit.c
+++ b/drivers/net/wireless/ath9k/xmit.c
@@ -1653,7 +1653,7 @@ static void ath_txq_drain_pending_buffers(struct ath_softc *sc,
}
}
-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)
{
@@ -1712,9 +1712,18 @@ static void ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf,
/* 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 */
@@ -1786,10 +1795,12 @@ static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf,
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 */
@@ -1800,7 +1811,15 @@ int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb,
return -1;
}
- ath_tx_setup_buffer(sc, bf, skb, txctl);
+ r = ath_tx_setup_buffer(sc, bf, skb, txctl);
+ if (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;
--
1.5.6.rc2.15.g457bb.dirty
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
