b43: Rewrite TX bounce buffer handling
Do not mess with the original skb, but allocate an independent bouncebuffer. This protects against bad interference with mac80211's assumptions about the skb (which already caused bugs). Signed-off-by: NMichael Buesch <mb@bu3sch.de> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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