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From:   Grygorii Strashko <grygorii.strashko@ti.com>
To:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
CC:     <netdev@vger.kernel.org>, Sekhar Nori <nsekhar@ti.com>,
        <linux-kernel@vger.kernel.org>, <linux-omap@vger.kernel.org>,
        Suman Anna <s-anna@ti.com>,
        Grygorii Strashko <grygorii.strashko@ti.com>
Subject: [PATCH] net: ethernet: ti: cpsw: fix ASSERT_RTNL() warning during suspend
Date:   Fri, 22 May 2020 19:39:31 +0300
Message-ID: <20200522163931.29905-1-grygorii.strashko@ti.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
---
 drivers/net/ethernet/ti/cpsw.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index c2c5bf87da01..ffeb8633e530 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1753,11 +1753,15 @@ static int cpsw_suspend(struct device *dev)
 	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);
 
-- 
2.17.1