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What should wireless drivers do under -ENOMEM

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Under heavy stress you can sometimes run into -ENOMEM and you inform
the callers. Now ath5k/ath9k both require dev_alloc_skb()'ing some
buffers when RXing. Right now we simply move on, but I think it'd be
nicer to inform mac80211 and let mac80211 decide. If the system is
under complete load I don't expect my drivers to bail out but to
somehow gracefully wait a while and then try again. But after a while
data starts to become pretty useless if you keep running into -ENOMEM.
What should we do then? Thoughts?

  Luis
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