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| author | Yan Wang <rk.code@outlook.com> | 2023-04-19 17:13:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-11 17:03:26 +0300 |
| commit | ad5b2cf5d1356ace5c8c213034839fa0d80f9d99 (patch) | |
| tree | d4ea1d777608f06b3882cdf70fc425401d1e1a05 /drivers/net/ethernet/stmicro/stmmac | |
| parent | fd40d2eb5ef0e4a6e49d004c558e239b65692159 (diff) | |
| download | linux-ad5b2cf5d1356ace5c8c213034839fa0d80f9d99.tar.xz | |
net: stmmac:fix system hang when setting up tag_8021q VLAN for DSA ports
[ Upstream commit 35226750f7ab9d49140d95bc7d38a2a9b0f4fdfc ]
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@intel.com>
Signed-off-by: Yan Wang <rk.code@outlook.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 |
1 files 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 fa3ce3b0d9a5..490315723062 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -6346,6 +6346,10 @@ 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; @@ -6353,16 +6357,18 @@ 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) |