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Message-Id: <0190bf79de5fb80bd14e0ca7d1a26af66607849b.1649310812.git.duoming@zju.edu.cn>
Date: Thu, 7 Apr 2022 14:33:19 +0800
From: Duoming Zhou <duoming@....edu.cn>
To: linux-kernel@...r.kernel.org
Cc: chris@...kel.net, jcmvbkbc@...il.com, mustafa.ismail@...el.com,
shiraz.saleem@...el.com, jgg@...pe.ca, wg@...ndegger.com,
mkl@...gutronix.de, davem@...emloft.net, kuba@...nel.org,
pabeni@...hat.com, jes@...ined-monkey.org,
gregkh@...uxfoundation.org, jirislaby@...nel.org,
alexander.deucher@....com, linux-xtensa@...ux-xtensa.org,
linux-rdma@...r.kernel.org, linux-can@...r.kernel.org,
netdev@...r.kernel.org, linux-hippi@...site.dk,
linux-staging@...ts.linux.dev, linux-serial@...r.kernel.org,
linux-usb@...r.kernel.org, Duoming Zhou <duoming@....edu.cn>
Subject: [PATCH 03/11] drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop()
There is a deadlock in ieee80211_beacons_stop(), which is shown below:
(Thread 1) | (Thread 2)
| ieee80211_send_beacon()
ieee80211_beacons_stop() | mod_timer()
spin_lock_irqsave() //(1) | (wait a time)
... | ieee80211_send_beacon_cb()
del_timer_sync() | spin_lock_irqsave() //(2)
(wait timer to stop) | ...
We hold ieee->beacon_lock in position (1) of thread 1 and use
del_timer_sync() to wait timer to stop, but timer handler
also need ieee->beacon_lock in position (2) of thread 2.
As a result, ieee80211_beacons_stop() will block forever.
This patch extracts del_timer_sync() from the protection of
spin_lock_irqsave(), which could let timer handler to obtain
the needed lock.
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
---
drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
index 1a43979939a..79f3fbe2555 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
@@ -528,9 +528,9 @@ static void ieee80211_beacons_stop(struct ieee80211_device *ieee)
spin_lock_irqsave(&ieee->beacon_lock, flags);
ieee->beacon_txing = 0;
- del_timer_sync(&ieee->beacon_timer);
spin_unlock_irqrestore(&ieee->beacon_lock, flags);
+ del_timer_sync(&ieee->beacon_timer);
}
void ieee80211_stop_send_beacons(struct ieee80211_device *ieee)
--
2.17.1
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