Messages in this thread Patch in this message | | | Date | Mon, 15 Aug 2011 19:43:03 -0700 | From | Greg KH <> | Subject | [20/26] ath5k: fix error handling in ath5k_beacon_send |
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3.0-stable review patch. If anyone has any objections, please let us know.
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From: Bob Copeland <me@bobcopeland.com>
commit bdc71bc59231f5542af13b5061b9ab124d093050 upstream.
This cleans up error handling for the beacon in case of dma mapping failure. We need to free the skb when dma mapping fails instead of nulling and leaking the pointer, and we should bail out to avoid giving the hardware the bad descriptor.
Finally, we need to perform the null check after trying to update the beacon, or else beacons will never be sent after a single mapping failure.
Signed-off-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/net/wireless/ath/ath5k/base.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-)
--- a/drivers/net/wireless/ath/ath5k/base.c +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -1748,6 +1748,8 @@ ath5k_beacon_setup(struct ath5k_softc *s if (dma_mapping_error(sc->dev, bf->skbaddr)) { ATH5K_ERR(sc, "beacon DMA mapping failed\n"); + dev_kfree_skb_any(skb); + bf->skb = NULL; return -EIO; } @@ -1832,8 +1834,6 @@ ath5k_beacon_update(struct ieee80211_hw ath5k_txbuf_free_skb(sc, avf->bbuf); avf->bbuf->skb = skb; ret = ath5k_beacon_setup(sc, avf->bbuf); - if (ret) - avf->bbuf->skb = NULL; out: return ret; } @@ -1854,6 +1854,7 @@ ath5k_beacon_send(struct ath5k_softc *sc struct ath5k_vif *avf; struct ath5k_buf *bf; struct sk_buff *skb; + int err; ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON, "in beacon_send\n"); @@ -1902,11 +1903,6 @@ ath5k_beacon_send(struct ath5k_softc *sc avf = (void *)vif->drv_priv; bf = avf->bbuf; - if (unlikely(bf->skb == NULL || sc->opmode == NL80211_IFTYPE_STATION || - sc->opmode == NL80211_IFTYPE_MONITOR)) { - ATH5K_WARN(sc, "bf=%p bf_skb=%p\n", bf, bf ? bf->skb : NULL); - return; - } /* * Stop any current dma and put the new frame on the queue. @@ -1920,8 +1916,17 @@ ath5k_beacon_send(struct ath5k_softc *sc /* refresh the beacon for AP or MESH mode */ if (sc->opmode == NL80211_IFTYPE_AP || - sc->opmode == NL80211_IFTYPE_MESH_POINT) - ath5k_beacon_update(sc->hw, vif); + sc->opmode == NL80211_IFTYPE_MESH_POINT) { + err = ath5k_beacon_update(sc->hw, vif); + if (err) + return; + } + + if (unlikely(bf->skb == NULL || sc->opmode == NL80211_IFTYPE_STATION || + sc->opmode == NL80211_IFTYPE_MONITOR)) { + ATH5K_WARN(sc, "bf=%p bf_skb=%p\n", bf, bf->skb); + return; + } trace_ath5k_tx(sc, bf->skb, &sc->txqs[sc->bhalq]);
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