linux-kernel - [PATCH AUTOSEL for 4.9 017/219] ath10k: fix a warning during channel switch with multiple vaps

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Date:   Sat, 3 Mar 2018 22:28:05 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Mohammed Shafi Shajakhan <mohammed@....qualcomm.com>,
        Kalle Valo <kvalo@....qualcomm.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 017/219] ath10k: fix a warning during channel
 switch with multiple vaps

From: Mohammed Shafi Shajakhan <mohammed@....qualcomm.com>

[ Upstream commit c73f8c00330f59ce9b1ace9ff698aca83390d358 ]

Doing a channel switch via hostapd_cli seems to update
the new channel context for each VAP's appropriately as below
in 'ath10k_mac_update_vif_chan', hence we can safely suppress the
warning that shows up during this operation and dump the warning only
if no vaps are available for channel switch

hostapd_cli -i wlan0 chan_switch 5 5200
OK

ath10k_pci : mac chanctx switch n_vifs 3 mode 1
ath10k_pci : mac chanctx switch vdev_id 2 freq 5180->5200 width 0->0
ath10k_pci : mac chanctx switch vdev_id 1 freq 5180->5200 width 0->0
ath10k_pci : mac chanctx switch vdev_id 0 freq 5180->5200 width 0->0

Call Trace:

WARNING: backports-20161201-3.14.77-9ab3068/drivers/net/wireless/ath/ath10k/mac.c:7126
[<c022f2d4>] (warn_slowpath_null) from [<bf7f150c>]
(ath10k_reconfig_complete+0xe4/0x25c [ath10k_core])
[<bf7f150c>] (ath10k_reconfig_complete [ath10k_core])
[<bf7f35f0>] (ath10k_mac_vif_ap_csa_work+0x214/0x370 [ath10k_core])
[<bf7f38b8>] (ath10k_mac_op_change_chanctx+0x108/0x128 [ath10k_core])
[<bf782ac0>] (ieee80211_recalc_chanctx_min_def+0x30c/0x430 [mac80211])
[<bf7830a4>] (ieee80211_recalc_smps_chanctx+0x2ec/0x840 [mac80211])
[<bf7843e8>] (ieee80211_vif_use_reserved_context+0x7c/0xf8 [mac80211])
[<bf7843e8>] (ieee80211_vif_use_reserved_context [mac80211])
[<bf76e5d4>] (ieee80211_csa_finalize_work+0x5c/0x88 [mac80211])

Fixes: d7bf4b4aba05 ("ath10k: fix ar->rx_channel updating logic")
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@....qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@....qualcomm.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/wireless/ath/ath10k/mac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 17ab8efdac35..696b90270615 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -7070,7 +7070,7 @@ ath10k_mac_update_rx_channel(struct ath10k *ar,
 	lockdep_assert_held(&ar->data_lock);
 
 	WARN_ON(ctx && vifs);
-	WARN_ON(vifs && n_vifs != 1);
+	WARN_ON(vifs && !n_vifs);
 
 	/* FIXME: Sort of an optimization and a workaround. Peers and vifs are
 	 * on a linked list now. Doing a lookup peer -> vif -> chanctx for each
-- 
2.14.1