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mac80211: don't use napi_gro_receive() outside NAPI context 

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.

Cc: stable@vger.kernel.org
Reported-by: Jean Trivelly <jean.trivelly@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2015-05-19 15:40:21 +02:00
parent 47b4e1fc49
commit 22d3a3c829
2 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/mac80211/ieee80211_i.h
View File

@ -205,6 +205,8 @@ 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.
@ -212,6 +214,7 @@ 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 {

5
net/mac80211/rx.c
View File

@ -2121,7 +2121,8 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
/* 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);
@ -3231,7 +3232,7 @@ void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
/* 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;