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Message-ID: <KL1PR01MB544874DAEE749710E67727A2E6629@KL1PR01MB5448.apcprd01.prod.exchangelabs.com>
Date: Wed, 19 Apr 2023 22:13:46 +0800
From: Yan Wang <rk.code@...look.com>
To: davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
kuba@...nel.org, mcoquelin.stm32@...il.com
Cc: Yan Wang <rk.code@...look.com>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
Joakim Zhang <qiangqing.zhang@....com>,
netdev@...r.kernel.org (open list:STMMAC ETHERNET DRIVER),
linux-stm32@...md-mailman.stormreply.com (moderated list:ARM/STM32
ARCHITECTURE),
linux-arm-kernel@...ts.infradead.org (moderated list:ARM/STM32
ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net-next v6] net: stmmac:fix system hang when setting up tag_8021q VLAN for DSA ports
The system hang because of dsa_tag_8021q_port_setup()->
stmmac_vlan_rx_add_vid().
I found in stmmac_drv_probe() that cailing pm_runtime_put()
disabled the clock.
First, when the kernel is compiled with CONFIG_PM=y,The stmmac's
resume/suspend is active.
Secondly,stmmac as DSA master,the dsa_tag_8021q_port_setup() function
will callback stmmac_vlan_rx_add_vid when DSA dirver starts. However,
The system is hanged for the stmmac_vlan_rx_add_vid() accesses its
registers after stmmac's clock is closed.
I would suggest adding the pm_runtime_resume_and_get() to the
stmmac_vlan_rx_add_vid().This guarantees that resuming clock output
while in use.
Fixes: b3dcb3127786 ("net: stmmac: correct clocks enabled in stmmac_vlan_rx_kill_vid()")
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Yan Wang <rk.code@...look.com>
---
v6:
- Add Reviewed Signature
v5: https://lore.kernel.org/netdev/KL1PR01MB544863D839654F0EC9485894E69C9@KL1PR01MB5448.apcprd01.prod.exchangelabs.com/
- Add version tags.
v4: https://lore.kernel.org/netdev/KL1PR01MB5448C7BF5A7AAC1CBCD5C36AE6989@KL1PR01MB5448.apcprd01.prod.exchangelabs.com/
- Fixed email address,but The Version number is wrong.
v3: https://lore.kernel.org/netdev/KL1PR01MB544872920F00149E3BDDC7ECE6999@KL1PR01MB5448.apcprd01.prod.exchangelabs.com/
- Fixed the Fixes tag,but Missing version change log.
v2: https://lore.kernel.org/netdev/KL1PR01MB54482D50B5C8713A2CA697DFE6999@KL1PR01MB5448.apcprd01.prod.exchangelabs.com/
- Add a error fixed tag.
v1: https://lore.kernel.org/netdev/KL1PR01MB5448020DE191340AE64530B0E6989@KL1PR01MB5448.apcprd01.prod.exchangelabs.com/
- the Subject is set incorrectly
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index d7fcab057032..f9cd063f1fe3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -6350,6 +6350,10 @@ static int stmmac_vlan_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid
bool is_double = false;
int ret;
+ ret = pm_runtime_resume_and_get(priv->device);
+ if (ret < 0)
+ return ret;
+
if (be16_to_cpu(proto) == ETH_P_8021AD)
is_double = true;
@@ -6357,16 +6361,18 @@ static int stmmac_vlan_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid
ret = stmmac_vlan_update(priv, is_double);
if (ret) {
clear_bit(vid, priv->active_vlans);
- return ret;
+ goto err_pm_put;
}
if (priv->hw->num_vlan) {
ret = stmmac_add_hw_vlan_rx_fltr(priv, ndev, priv->hw, proto, vid);
if (ret)
- return ret;
+ goto err_pm_put;
}
+err_pm_put:
+ pm_runtime_put(priv->device);
- return 0;
+ return ret;
}
static int stmmac_vlan_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
--
2.17.1
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