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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Adiel Aloni <adiel.aloni@intel.com>,
        Luca Coelho <luciano.coelho@intel.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 213/219] mac80211_hwsim: enforce
 PS_MANUAL_POLL to be set after PS_ENABLED
Thread-Topic: [PATCH AUTOSEL for 4.9 213/219] mac80211_hwsim: enforce
 PS_MANUAL_POLL to be set after PS_ENABLED
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Date:   Sat, 3 Mar 2018 22:30:00 +0000
Message-ID: <20180303222716.26640-213-alexander.levin@microsoft.com>
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From: Adiel Aloni <adiel.aloni@intel.com>

[ Upstream commit e16ea4bb516bc21ea2202f2107718b29218bea59 ]

Enforce using PS_MANUAL_POLL in ps hwsim debugfs to trigger a poll,
only if PS_ENABLED was set before.
This is required due to commit c9491367b759 ("mac80211: always update the
PM state of a peer on MGMT / DATA frames") that enforces the ap to
check only mgmt/data frames ps bit, and then update station's power save
accordingly.
When sending only ps-poll (control frame) the ap will not be aware that
the station entered power save.
Setting ps enable before triggering ps_poll, will send NDP with PM bit
enabled first.

Signed-off-by: Adiel Aloni <adiel.aloni@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/net/wireless/mac80211_hwsim.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/m=
ac80211_hwsim.c
index 990c857992f6..d12c121806bf 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -728,16 +728,21 @@ static int hwsim_fops_ps_write(void *dat, u64 val)
 	    val !=3D PS_MANUAL_POLL)
 		return -EINVAL;
=20
-	old_ps =3D data->ps;
-	data->ps =3D val;
-
-	local_bh_disable();
 	if (val =3D=3D PS_MANUAL_POLL) {
+		if (data->ps !=3D PS_ENABLED)
+			return -EINVAL;
+		local_bh_disable();
 		ieee80211_iterate_active_interfaces_atomic(
 			data->hw, IEEE80211_IFACE_ITER_NORMAL,
 			hwsim_send_ps_poll, data);
-		data->ps_poll_pending =3D true;
-	} else if (old_ps =3D=3D PS_DISABLED && val !=3D PS_DISABLED) {
+		local_bh_enable();
+		return 0;
+	}
+	old_ps =3D data->ps;
+	data->ps =3D val;
+
+	local_bh_disable();
+	if (old_ps =3D=3D PS_DISABLED && val !=3D PS_DISABLED) {
 		ieee80211_iterate_active_interfaces_atomic(
 			data->hw, IEEE80211_IFACE_ITER_NORMAL,
 			hwsim_send_nullfunc_ps, data);
--=20
2.14.1