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From: Luca Coelho <luca@coelho.fi>
To: johannes@sipsolutions.net
Cc: luca@coelho.fi, linux-wireless@vger.kernel.org
Subject: [PATCH 12/31] mac80211: Properly WARN on HW scan before restart
Date: Fri, 18 Jun 2021 13:41:37 +0300	[thread overview]
Message-ID: <iwlwifi.20210618133832.8238ab3e19ab.I2693c581c70251472b4f9089e37e06fb2c18268f@changeid> (raw)
In-Reply-To: <20210618104156.747775-1-luca@coelho.fi>

From: Ilan Peer <ilan.peer@intel.com>

The following race was possible:

1. The device driver requests HW restart.
2. A scan is requested from user space and is propagated
   to the driver. During this flow HW_SCANNING flag is set.
3. The thread that handles the HW restart is scheduled,
   and before starting the actual reconfiguration it
   checks that HW_SCANNING is not set. The flow does so
   without acquiring any lock, and thus the WARN fires.

Fix this by checking that HW_SCANNING is on only after RTNL is
acquired, i.e., user space scan request handling is no longer
in transit.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/mac80211/main.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 62145e5f9628..da3e0ca6aa31 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -256,14 +256,13 @@ static void ieee80211_restart_work(struct work_struct *work)
 	/* wait for scan work complete */
 	flush_workqueue(local->workqueue);
 	flush_work(&local->sched_scan_stopped_work);
+	flush_work(&local->radar_detected_work);
+
+	rtnl_lock();
 
 	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 	     "%s called with hardware scan in progress\n", __func__);
 
-	flush_work(&local->radar_detected_work);
-	/* we might do interface manipulations, so need both */
-	rtnl_lock();
-	wiphy_lock(local->hw.wiphy);
 	list_for_each_entry(sdata, &local->interfaces, list) {
 		/*
 		 * XXX: there may be more work for other vif types and even
-- 
2.32.0


  parent reply	other threads:[~2021-06-18 11:06 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-18 10:41 [PATCH 00/31] cfg80211/mac80211 patches from our internal tree 2021-06-18 Luca Coelho
2021-06-18 10:41 ` [PATCH 01/31] mac80211: add HE 6GHz cap IE in 6GHz band only Luca Coelho
2021-06-18 10:41 ` [PATCH 02/31] mac80211: do not add twice the HE 6GHz cap IE Luca Coelho
2021-06-18 17:14   ` Florian Fainelli
2021-06-18 20:17     ` Luca Coelho
2021-06-23 11:04       ` Luca Coelho
2021-06-18 10:41 ` [PATCH 03/31] ieee80211: define timing measurement in extended capabilities IE Luca Coelho
2021-06-18 10:41 ` [PATCH 04/31] cfg80211: make certificate generation more robust Luca Coelho
2021-06-18 10:41 ` [PATCH 05/31] mac80211: handle rate control (RC) racing with chanctx definition Luca Coelho
2021-06-18 10:41 ` [PATCH 06/31] cfg80211: avoid double free of PMSR request Luca Coelho
2021-06-18 10:41 ` [PATCH 07/31] mac80211: allow SMPS requests only in client mode Luca Coelho
2021-06-18 10:41 ` [PATCH 08/31] mac80211: free skb in WEP error case Luca Coelho
2021-06-18 10:41 ` [PATCH 09/31] mac80211: move SMPS mode setting after ieee80211_prep_connection Luca Coelho
2021-06-18 10:41 ` [PATCH 10/31] mac80211: add to bss_conf if broadcast TWT is supported Luca Coelho
2021-06-18 10:41 ` [PATCH 11/31] nl80211/cfg80211: add BSS color to NDP ranging parameters Luca Coelho
2021-06-18 10:41 ` Luca Coelho [this message]
2021-06-18 10:41 ` [PATCH 13/31] ieee80211: add defines for HE PHY cap byte 10 Luca Coelho
2021-06-18 10:41 ` [PATCH 14/31] cfg80211: add cfg80211_any_usable_channels() Luca Coelho
2021-06-18 10:41 ` [PATCH 15/31] mac80211: conditionally advertise HE in probe requests Luca Coelho
2021-06-18 10:41 ` [PATCH 16/31] cfg80211: Support hidden AP discovery over 6GHz band Luca Coelho
2021-06-18 10:41 ` [PATCH 17/31] mac80211: always include HE 6GHz capability in probe request Luca Coelho
2021-06-18 10:41 ` [PATCH 18/31] mac80211: always include HE 6GHz capability in assoc request Luca Coelho
2021-06-18 10:41 ` [PATCH 19/31] mac80211: rearrange struct txq_info for fewer holes Luca Coelho
2021-06-18 10:41 ` [PATCH 20/31] mac80211: handle various extensible elements correctly Luca Coelho
2021-06-18 10:41 ` [PATCH 21/31] cfg80211: set custom regdomain after wiphy registration Luca Coelho
2021-06-18 10:41 ` [PATCH 22/31] mac80211: improve AP disconnect message Luca Coelho
2021-06-18 10:41 ` [PATCH 23/31] cfg80211: trace more information in assoc trace event Luca Coelho
2021-06-18 10:41 ` [PATCH 24/31] mac80211: reset profile_periodicity/ema_ap Luca Coelho
2021-06-18 10:41 ` [PATCH 25/31] mac80211: remove use of ieee80211_get_he_sta_cap() Luca Coelho
2021-06-18 10:41 ` [PATCH 26/31] cfg80211: remove ieee80211_get_he_sta_cap() Luca Coelho
2021-06-18 10:41 ` [PATCH 27/31] cfg80211: allow advertising vendor-specific capabilities Luca Coelho
2021-06-18 10:41 ` [PATCH 28/31] mac80211: add vendor-specific capabilities to assoc request Luca Coelho
2021-06-18 10:41 ` [PATCH 29/31] mac8021: Allow probe request injection on passive non radar channels Luca Coelho
2021-06-18 10:41 ` [PATCH 30/31] mac80211: notify driver on mgd TX completion Luca Coelho
2021-06-18 10:41 ` [PATCH 31/31] cfg80211: reg: improve bad regulatory warning Luca Coelho

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