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Date: Wed, 3 Jun 2015 21:09:29 +0900 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jean Trivelly <jean.trivelly@...el.com>, Johannes Berg <johannes.berg@...el.com> Subject: [PATCH 4.0 099/148] mac80211: dont use napi_gro_receive() outside NAPI context 4.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johannes Berg <johannes.berg@...el.com> commit 22d3a3c829fa9ecdb493d1f1f2838d543f8d86a3 upstream. No matter how the driver manages its NAPI context, there's no way sending frames to it from a timer can be correct, since it would corrupt the internal GRO lists. To avoid that, always use the non-NAPI path when releasing frames from the timer. Reported-by: Jean Trivelly <jean.trivelly@...el.com> Signed-off-by: Johannes Berg <johannes.berg@...el.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/mac80211/ieee80211_i.h | 3 +++ net/mac80211/rx.c | 5 +++-- 2 files changed, 6 insertions(+), 2 deletions(-) --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -204,6 +204,8 @@ enum ieee80211_packet_rx_flags { * @IEEE80211_RX_CMNTR: received on cooked monitor already * @IEEE80211_RX_BEACON_REPORTED: This frame was already reported * to cfg80211_report_obss_beacon(). + * @IEEE80211_RX_REORDER_TIMER: this frame is released by the + * reorder buffer timeout timer, not the normal RX path * * These flags are used across handling multiple interfaces * for a single frame. @@ -211,6 +213,7 @@ enum ieee80211_packet_rx_flags { enum ieee80211_rx_flags { IEEE80211_RX_CMNTR = BIT(0), IEEE80211_RX_BEACON_REPORTED = BIT(1), + IEEE80211_RX_REORDER_TIMER = BIT(2), }; struct ieee80211_rx_data { --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2106,7 +2106,8 @@ ieee80211_deliver_skb(struct ieee80211_r /* deliver to local stack */ skb->protocol = eth_type_trans(skb, dev); memset(skb->cb, 0, sizeof(skb->cb)); - if (rx->local->napi) + if (!(rx->flags & IEEE80211_RX_REORDER_TIMER) && + rx->local->napi) napi_gro_receive(rx->local->napi, skb); else netif_receive_skb(skb); @@ -3215,7 +3216,7 @@ void ieee80211_release_reorder_timeout(s /* This is OK -- must be QoS data frame */ .security_idx = tid, .seqno_idx = tid, - .flags = 0, + .flags = IEEE80211_RX_REORDER_TIMER, }; struct tid_ampdu_rx *tid_agg_rx; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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