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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.4 005/142] net: ethernet: ti: cpsw: fix ASSERT_RTNL() warning during suspend
Date:   Mon,  1 Jun 2020 19:52:43 +0200
Message-Id: <20200601174038.612777995@linuxfoundation.org>
In-Reply-To: <20200601174037.904070960@linuxfoundation.org>
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From: Grygorii Strashko <grygorii.strashko@ti.com>

[ Upstream commit 4c64b83d03f4aafcdf710caad994cbc855802e74 ]

vlan_for_each() are required to be called with rtnl_lock taken, otherwise
ASSERT_RTNL() warning will be triggered - which happens now during System
resume from suspend:
  cpsw_suspend()
  |- cpsw_ndo_stop()
    |- __hw_addr_ref_unsync_dev()
      |- cpsw_purge_all_mc()
         |- vlan_for_each()
            |- ASSERT_RTNL();

Hence, fix it by surrounding cpsw_ndo_stop() by rtnl_lock/unlock() calls.

Fixes: 15180eca569b ("net: ethernet: ti: cpsw: fix vlan mcast")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/ti/cpsw.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -2999,11 +2999,15 @@ static int cpsw_suspend(struct device *d
 	struct cpsw_common *cpsw = dev_get_drvdata(dev);
 	int i;
 
+	rtnl_lock();
+
 	for (i = 0; i < cpsw->data.slaves; i++)
 		if (cpsw->slaves[i].ndev)
 			if (netif_running(cpsw->slaves[i].ndev))
 				cpsw_ndo_stop(cpsw->slaves[i].ndev);
 
+	rtnl_unlock();
+
 	/* Select sleep pin state */
 	pinctrl_pm_select_sleep_state(dev);