Commit 3ff23cd5 authored by Toke Høiland-Jørgensen's avatar Toke Høiland-Jørgensen Committed by Johannes Berg
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mac80211: Set lower memory limit for non-VHT devices

Small devices can run out of memory from queueing too many packets. If
VHT is not supported by the PHY, having more than 4 MBytes of total
queue in the TXQ intermediate queues is not needed, and so we can safely
limit the memory usage in these cases and avoid OOM.
Signed-off-by: default avatarToke Høiland-Jørgensen <>
Signed-off-by: default avatarJohannes Berg <>
parent 2a4e675d
......@@ -1433,6 +1433,8 @@ int ieee80211_txq_setup_flows(struct ieee80211_local *local)
struct fq *fq = &local->fq;
int ret;
int i;
bool supp_vht = false;
enum nl80211_band band;
if (!local->ops->wake_tx_queue)
return 0;
......@@ -1441,6 +1443,23 @@ int ieee80211_txq_setup_flows(struct ieee80211_local *local)
if (ret)
return ret;
* If the hardware doesn't support VHT, it is safe to limit the maximum
* queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
for (band = 0; band < NUM_NL80211_BANDS; band++) {
struct ieee80211_supported_band *sband;
sband = local->hw.wiphy->bands[band];
if (!sband)
supp_vht = supp_vht || sband->vht_cap.vht_supported;
if (!supp_vht)
fq->memory_limit = 4 << 20; /* 4 Mbytes */
local->cparams.interval = MS2TIME(100);
local-> = MS2TIME(20);
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