mac80211: allow drivers to sleep in ampdu_action

Allow drivers to sleep, and indicate this in
the documentation. ath9k has some locking I
don't understand, so keep it safe and disable
BHs in it, all other drivers look fine with
the context change.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index b8b76dd..e1b8456 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1769,6 +1769,8 @@ static int ath9k_ampdu_action(struct ieee80211_hw *hw,
        struct ath_softc *sc = aphy->sc;
        int ret = 0;
 
+       local_bh_disable();
+
        switch (action) {
        case IEEE80211_AMPDU_RX_START:
                if (!(sc->sc_flags & SC_OP_RXAGGR))
@@ -1798,6 +1800,8 @@ static int ath9k_ampdu_action(struct ieee80211_hw *hw,
                          "Unknown AMPDU action\n");
        }
 
+       local_bh_enable();
+
        return ret;
 }
 

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 7f9401b..bbae3d9 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1640,7 +1640,7 @@ enum ieee80211_ampdu_mlme_action {
  *     is the first frame we expect to perform the action on. Notice
  *     that TX/RX_STOP can pass NULL for this parameter.
  *     Returns a negative error code on failure.
- *     The callback must be atomic.
+ *     The callback can sleep.
  *
  * @get_survey: Return per-channel survey information
  *

diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 7e86c6f..a4fcbcc 100644 (file)
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -352,11 +352,10 @@ static inline int drv_ampdu_action(struct ieee80211_local *local,
 
        might_sleep();
 
-       local_bh_disable();
        if (local->ops->ampdu_action)
                ret = local->ops->ampdu_action(&local->hw, &sdata->vif, action,
                                               sta, tid, ssn);
-       local_bh_enable();
+
        trace_drv_ampdu_action(local, sdata, action, sta, tid, ssn, ret);
        return ret;
 }