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52 lines
1.6 KiB
Diff
52 lines
1.6 KiB
Diff
From: Johannes Berg <johannes.berg@intel.com>
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Date: Thu, 30 Aug 2018 10:55:49 +0200
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Subject: [PATCH] mac80211: always account for A-MSDU header changes
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In the error path of changing the SKB headroom of the second
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A-MSDU subframe, we would not account for the already-changed
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length of the first frame that just got converted to be in
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A-MSDU format and thus is a bit longer now.
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Fix this by doing the necessary accounting.
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It would be possible to reorder the operations, but that would
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make the code more complex (to calculate the necessary pad),
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and the headroom expansion should not fail frequently enough
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to make that worthwhile.
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Fixes: 6e0456b54545 ("mac80211: add A-MSDU tx support")
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Acked-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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---
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--- a/net/mac80211/tx.c
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+++ b/net/mac80211/tx.c
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@@ -3232,7 +3232,7 @@ static bool ieee80211_amsdu_aggregate(st
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if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
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2 + pad))
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- goto out;
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+ goto out_recalc;
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ret = true;
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data = skb_push(skb, ETH_ALEN + 2);
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@@ -3249,11 +3249,13 @@ static bool ieee80211_amsdu_aggregate(st
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head->data_len += skb->len;
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*frag_tail = skb;
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- flow->backlog += head->len - orig_len;
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- tin->backlog_bytes += head->len - orig_len;
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-
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- fq_recalc_backlog(fq, tin, flow);
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+out_recalc:
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+ if (head->len != orig_len) {
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+ flow->backlog += head->len - orig_len;
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+ tin->backlog_bytes += head->len - orig_len;
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+ fq_recalc_backlog(fq, tin, flow);
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+ }
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out:
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fq->memory_usage += head->truesize - orig_truesize;
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