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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>
This commit is contained in:
Luis R. Rodriguez 2008-12-03 03:35:30 -08:00 committed by John W. Linville
parent f8316df10c
commit c112d0c5b8
1 changed files with 20 additions and 2 deletions
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22
drivers/net/wireless/ath9k/xmit.c
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@ -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;
}