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authorLuis R. Rodriguez <lrodriguez@atheros.com>2008-12-03 03:35:30 -0800
committerJohn W. Linville <linville@tuxdriver.com>2008-12-05 09:35:59 -0500
commitc112d0c5b89037dd618083b5fdf4bb36b0c51d77 (patch)
tree195a14b4482ef3506ffa51caa4ab7f6a5b58e003 /drivers/net/wireless
parentf8316df10c4e3bec5b4c3a5a8e026c577640c3a6 (diff)
ath9k: Use GFP_ATOMIC when allocating TX private area
Using GFP_KERNEL was wrong and produces a 'scheduling while atomic' bug as we're in a tasklet. Also, check for proper return values now, in case allocation fails and be sure to stop the TX queue in case of memory issues but gaurantee the TX queue will eventually be woken up. Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com> Signed-off-by: Sujith <Sujith.Manoharan@atheros.com> Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless')
-rw-r--r--drivers/net/wireless/ath9k/xmit.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c
index 17fd05e2f24..9de27c681b8 100644
--- a/drivers/net/wireless/ath9k/xmit.c
+++ b/drivers/net/wireless/ath9k/xmit.c
@@ -1652,7 +1652,9 @@ static int ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf,
int hdrlen;
__le16 fc;
- tx_info_priv = kzalloc(sizeof(*tx_info_priv), GFP_KERNEL);
+ tx_info_priv = kzalloc(sizeof(*tx_info_priv), GFP_ATOMIC);
+ if (unlikely(!tx_info_priv))
+ return -ENOMEM;
tx_info->rate_driver_data[0] = tx_info_priv;
hdrlen = ieee80211_get_hdrlen_from_skb(skb);
fc = hdr->frame_control;
@@ -1801,10 +1803,26 @@ int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb,
r = ath_tx_setup_buffer(sc, bf, skb, txctl);
if (unlikely(r)) {
- spin_lock_bh(&sc->sc_txbuflock);
+ struct ath_txq *txq = txctl->txq;
+
DPRINTF(sc, ATH_DBG_FATAL, "TX mem alloc failure\n");
+
+ /* upon ath_tx_processq() this TX queue will be resumed, we
+ * guarantee this will happen by knowing beforehand that
+ * we will at least have to run TX completionon one buffer
+ * on the queue */
+ spin_lock_bh(&txq->axq_lock);
+ if (ath_txq_depth(sc, txq->axq_qnum) > 1) {
+ ieee80211_stop_queue(sc->hw,
+ skb_get_queue_mapping(skb));
+ txq->stopped = 1;
+ }
+ spin_unlock_bh(&txq->axq_lock);
+
+ spin_lock_bh(&sc->sc_txbuflock);
list_add_tail(&bf->list, &sc->sc_txbuf);
spin_unlock_bh(&sc->sc_txbuflock);
+
return r;
}