From 134cc4cefad34d8d24670d8a911b59c3b89c6731 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Wed, 2 Oct 2019 16:49:46 +0200 Subject: net: stmmac: Avoid deadlock on suspend/resume The stmmac driver will try to acquire its private mutex during suspend via phylink_resolve() -> stmmac_mac_link_down() -> stmmac_eee_init(). However, the phylink configuration is updated with the private mutex held already, which causes a deadlock during suspend. Fix this by moving the phylink configuration updates out of the region of code protected by the private mutex. Fixes: 19e13cb27b99 ("net: stmmac: Hold rtnl lock in suspend/resume callbacks") Suggested-by: Bitan Biswas Signed-off-by: Thierry Reding Signed-off-by: David S. Miller --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 843d53e084b7..c76a1336a451 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -4716,10 +4716,10 @@ int stmmac_suspend(struct device *dev) if (!ndev || !netif_running(ndev)) return 0; - mutex_lock(&priv->lock); - phylink_mac_change(priv->phylink, false); + mutex_lock(&priv->lock); + netif_device_detach(ndev); stmmac_stop_all_queues(priv); @@ -4733,9 +4733,11 @@ int stmmac_suspend(struct device *dev) stmmac_pmt(priv, priv->hw, priv->wolopts); priv->irq_wake = 1; } else { + mutex_unlock(&priv->lock); rtnl_lock(); phylink_stop(priv->phylink); rtnl_unlock(); + mutex_lock(&priv->lock); stmmac_mac_set(priv, priv->ioaddr, false); pinctrl_pm_select_sleep_state(priv->device); @@ -4827,6 +4829,8 @@ int stmmac_resume(struct device *dev) stmmac_start_all_queues(priv); + mutex_unlock(&priv->lock); + if (!device_may_wakeup(priv->device)) { rtnl_lock(); phylink_start(priv->phylink); @@ -4835,8 +4839,6 @@ int stmmac_resume(struct device *dev) phylink_mac_change(priv->phylink, true); - mutex_unlock(&priv->lock); - return 0; } EXPORT_SYMBOL_GPL(stmmac_resume); -- cgit v1.2.3