linux-kernel - Re: [PATCH] net: ethernet: ti: cpsw: fix ASSERT

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Date:   Fri, 22 May 2020 20:08:12 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Suman Anna <s-anna@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, Sekhar Nori <nsekhar@...com>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] net: ethernet: ti: cpsw: fix ASSERT_RTNL() warning during
 suspend



On 22/05/2020 19:50, Suman Anna wrote:
> On 5/22/20 11:39 AM, Grygorii Strashko wrote:
>> 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
> 
> Format for this should be
> Fixes: 15180eca569b ("net: ethernet: ti: cpsw: fix vlan mcast")

Right sorry

> 
> regards
> Suman
> 
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...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);
>>
> 

-- 
Best regards,
grygorii