On Sunday, August 17, 2014 01:48:07 PM Andreea-Cristina Bernat wrote:
> The rcu_dereference() call is used directly in a condition.
> Since its return value is never dereferenced it is recommended to use
> "rcu_access_pointer()" instead of "rcu_dereference()".
> Therefore, this patch makes the replacement.
> [...]
> Signed-off-by: Andreea-Cristina Bernat <bernat.ada@xxxxxxxxx>
> ---
> drivers/net/wireless/ath/carl9170/main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c
> index f8ded84..12018ff 100644
> --- a/drivers/net/wireless/ath/carl9170/main.c
> +++ b/drivers/net/wireless/ath/carl9170/main.c
> @@ -1431,7 +1431,7 @@ static int carl9170_op_ampdu_action(struct ieee80211_hw *hw,
> return -EOPNOTSUPP;
>
> rcu_read_lock();
> - if (rcu_dereference(sta_info->agg[tid])) {
> + if (rcu_access_pointer(sta_info->agg[tid])) {
> rcu_read_unlock();
> return -EBUSY;
> }
There's more. The check does not do a whole lot. I think *it* [the check] and the
rcu_read_[un]lock [and the return -EBUSY] can be removed completely from the
IEEE80211_AMPDU_TX_START code-path in carl9170_op_ampdu_action.
It would be awesome, if you could you make a patch which removes this
unneeded cosmic-ray-protection check :-) .
Thanks
Christian
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