On Fri, Apr 17, 2015 at 6:15 PM, Johannes Berg
<johan...@sipsolutions.net> wrote:
> From: Johannes Berg <johannes.b...@intel.com>
>
> In order to speed up mac80211's TX path, add the "fast-xmit" cache
> that will cache the data frame 802.11 header and other data to be
> able to build the frame more quickly. This cache is rebuilt when
> external triggers imply changes, but a lot of the checks done per
> packet today are simplified away to the check for the cache.
>
> There's also a more detailed description in the code.
>
> Signed-off-by: Johannes Berg <johannes.b...@intel.com>
> ---
[...]

> +       build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
> +       if (!build.key)
> +               build.key = rcu_access_pointer(sdata->default_unicast_key);
don't you need rcu_dereference here? (and you don't seem to be inside
rcu section here)

Eliad.
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