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From: Wong Vee Khee <vee.khee.wong@intel.com>
To: Giuseppe Cavallaro <peppe.cavallaro@st.com>,
	Alexandre Torgue <alexandre.torgue@st.com>,
	Jose Abreu <joabreu@synopsys.com>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Ong Boon Leong <boon.leong.ong@intel.com>,
	Voon Wei Feng <weifeng.voon@intel.com>,
	Wong Vee Khee <vee.khee.wong@intel.com>,
	Christophe ROULLIER <christophe.roullier@st.com>
Subject: [PATCH v2 net 1/1] net: stmmac: Use rtnl_lock/unlock on netif_set_real_num_rx_queues() call
Date: Sun, 15 Nov 2020 15:42:10 +0800	[thread overview]
Message-ID: <20201115074210.23605-1-vee.khee.wong@intel.com> (raw)

Fix an issue where dump stack is printed on suspend resume flow due to
netif_set_real_num_rx_queues() is not called with rtnl_lock held().

Fixes: 686cff3d7022 ("net: stmmac: Fix incorrect location to set real_num_rx|tx_queues")
Reported-by: Christophe ROULLIER <christophe.roullier@st.com>
Tested-by: Christophe ROULLIER <christophe.roullier@st.com>
Cc: Alexandre TORGUE <alexandre.torgue@st.com>
Reviewed-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Wong Vee Khee <vee.khee.wong@intel.com>
---
v2 changelog:
- Move rtnl_lock() before priv->lock and release it after to avoid a
  possible ABBA deadlock scenario.
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index ba855465a2db..c8770e9668a1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5272,6 +5272,7 @@ int stmmac_resume(struct device *dev)
 			return ret;
 	}
 
+	rtnl_lock();
 	mutex_lock(&priv->lock);
 
 	stmmac_reset_queues_param(priv);
@@ -5287,6 +5288,7 @@ int stmmac_resume(struct device *dev)
 	stmmac_enable_all_queues(priv);
 
 	mutex_unlock(&priv->lock);
+	rtnl_unlock();
 
 	if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
 		rtnl_lock();
-- 
2.17.0


WARNING: multiple messages have this Message-ID (diff)
From: Wong Vee Khee <vee.khee.wong@intel.com>
To: Giuseppe Cavallaro <peppe.cavallaro@st.com>,
	Alexandre Torgue <alexandre.torgue@st.com>,
	Jose Abreu <joabreu@synopsys.com>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Voon Wei Feng <weifeng.voon@intel.com>,
	Wong Vee Khee <vee.khee.wong@intel.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Christophe ROULLIER <christophe.roullier@st.com>,
	Ong Boon Leong <boon.leong.ong@intel.com>,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 net 1/1] net: stmmac: Use rtnl_lock/unlock on netif_set_real_num_rx_queues() call
Date: Sun, 15 Nov 2020 15:42:10 +0800	[thread overview]
Message-ID: <20201115074210.23605-1-vee.khee.wong@intel.com> (raw)

Fix an issue where dump stack is printed on suspend resume flow due to
netif_set_real_num_rx_queues() is not called with rtnl_lock held().

Fixes: 686cff3d7022 ("net: stmmac: Fix incorrect location to set real_num_rx|tx_queues")
Reported-by: Christophe ROULLIER <christophe.roullier@st.com>
Tested-by: Christophe ROULLIER <christophe.roullier@st.com>
Cc: Alexandre TORGUE <alexandre.torgue@st.com>
Reviewed-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Wong Vee Khee <vee.khee.wong@intel.com>
---
v2 changelog:
- Move rtnl_lock() before priv->lock and release it after to avoid a
  possible ABBA deadlock scenario.
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index ba855465a2db..c8770e9668a1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5272,6 +5272,7 @@ int stmmac_resume(struct device *dev)
 			return ret;
 	}
 
+	rtnl_lock();
 	mutex_lock(&priv->lock);
 
 	stmmac_reset_queues_param(priv);
@@ -5287,6 +5288,7 @@ int stmmac_resume(struct device *dev)
 	stmmac_enable_all_queues(priv);
 
 	mutex_unlock(&priv->lock);
+	rtnl_unlock();
 
 	if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
 		rtnl_lock();
-- 
2.17.0


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             reply	other threads:[~2020-11-15  7:39 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-15  7:42 Wong Vee Khee [this message]
2020-11-15  7:42 ` [PATCH v2 net 1/1] net: stmmac: Use rtnl_lock/unlock on netif_set_real_num_rx_queues() call Wong Vee Khee
2020-11-17  0:20 ` patchwork-bot+netdevbpf
2020-11-17  0:20   ` patchwork-bot+netdevbpf

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