diff options
| author | Luis R. Rodriguez <lrodriguez@atheros.com> | 2008-12-03 03:35:29 -0800 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-12-05 09:35:59 -0500 |
| commit | f8316df10c4e3bec5b4c3a5a8e026c577640c3a6 (patch) | |
| tree | f56af9c85de35bda97a0b45275eed6b6f7362712 /drivers/net/wireless/ath9k/xmit.c | |
| parent | 73a5267087b5acd4a4288e0a1b809f09ca578d49 (diff) | |
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>
Diffstat (limited to 'drivers/net/wireless/ath9k/xmit.c')
| -rw-r--r-- | drivers/net/wireless/ath9k/xmit.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c index 5cf83111e1a..17fd05e2f24 100644 --- a/drivers/net/wireless/ath9k/xmit.c +++ b/drivers/net/wireless/ath9k/xmit.c @@ -1642,7 +1642,7 @@ 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) { @@ -1701,9 +1701,18 @@ 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 */ @@ -1775,10 +1784,12 @@ 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 */ @@ -1788,7 +1799,15 @@ 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 (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; |