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mac80211: correct fragmentation threshold check 

The fragmentation threshold is defined to be including the
FCS, and the code that sets the TX_FRAGMENTED flag correctly
accounts for those four bytes. The code that verifies this
doesn't though, which could lead to spurious warnings and
frames being dropped although everything is ok. Correct the
code by accounting for the FCS.

(JWL -- The problem is described here:
 http://article.gmane.org/gmane.linux.kernel.wireless.general/32205 )

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-04-29 23:35:56 +02:00 committed by John W. Linville
parent 3ee59f8d0d
commit 8ccd8f2112
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/tx.c
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@ -772,7 +772,7 @@ ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
hdrlen = ieee80211_hdrlen(hdr->frame_control);
/* internal error, why is TX_FRAGMENTED set? */
if (WARN_ON(skb->len <= frag_threshold))
if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
return TX_DROP;
/*