linux-kernel - [PATCH 4.19 113/118] mac80211: fix GFP

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Date:   Tue, 11 Dec 2018 16:42:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yan-Hsuan Chuang <yhchuang@...ltek.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 4.19 113/118] mac80211: fix GFP_KERNEL under tasklet context

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yan-Hsuan Chuang <yhchuang@...ltek.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@...r.kernel.org
Fixes: ff84e7bfe176 ("mac80211: Add support to notify ht/vht opmode modification.")
Signed-off-by: Yan-Hsuan Chuang <yhchuang@...ltek.com>
ACKed-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 		}
 		default: