[PATCH 4.19 113/118] mac80211: fix GFP_KERNEL under tasklet context

Greg Kroah-Hartman
2018-12-11T15:58:58Z

From: Yan-Hsuan Chuang <yhchuang@realtek.com>

commit c752cac9db1b0c469db7ba9d17af4ba708984db5 upstream.

cfg80211_sta_opmode_change_notify needs a gfp_t flag to hint the nl80211
stack when allocating new skb, but it is called under tasklet context
here with GFP_KERNEL and kernel will yield a warning about it.

Cc: stable@vger.kernel.org
Fixes: ff84e7bfe176 ("mac80211: Add support to notify ht/vht opmode modification.")
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
ACKed-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/mac80211/rx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3029,7 +3029,7 @@ ieee80211_rx_h_action(struct ieee80211_r
cfg80211_sta_opmode_change_notify(sdata->dev,
rx->sta->addr,
&sta_opmode,
- GFP_KERNEL);
+ GFP_ATOMIC);
goto handled;
}
case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
@@ -3066,7 +3066,7 @@ ieee80211_rx_h_action(struct ieee80211_r
cfg80211_sta_opmode_change_notify(sdata->dev,
rx->sta->addr,
&sta_opmode,
- GFP_KERNEL);
+ GFP_ATOMIC);
goto handled;
}