First of all, I applied your patch with now, but changed the commit message. I hope it still makes sense. > Ops, maybe I got your point: > ieee80211_amsdu_realloc_pad() in ieee80211_amsdu_prepare_head() can > expand the headroom on the first frame Right. > but if ieee80211_amsdu_realloc_pad() on the second one fails, we do > not take into account the extra len added on the > first subframe. Is that what you mean? Yes, that's what I was thinking of, but you described it much better than me :) If this needs to be addressed, please send a separate patch. johannes