netdev - Re: [net PATCH] xdp: obtain the mem_id mutex before trying to remove an entry.

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Date:   Wed, 4 Dec 2019 12:07:22 +0200
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <kernel-team@...com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>
Subject: Re: [net PATCH] xdp: obtain the mem_id mutex before trying to remove
 an entry.



On 04/12/2019 10:32, Jesper Dangaard Brouer wrote:
> On Tue, 3 Dec 2019 14:01:14 -0800
> Jonathan Lemon <jonathan.lemon@...il.com> wrote:
> 
>> A lockdep splat was observed when trying to remove an xdp memory
>> model from the table since the mutex was obtained when trying to
>> remove the entry, but not before the table walk started:
>>
>> Fix the splat by obtaining the lock before starting the table walk.
>>
>> Fixes: c3f812cea0d7 ("page_pool: do not release pool until inflight == 0.")
>> Reported-by: Grygorii Strashko <grygorii.strashko@...com>
>> Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
> 
> Have you tested if this patch fix the problem reported by Grygorii?
> 
> Link: https://lore.kernel.org/netdev/c2de8927-7bca-612f-cdfd-e9112fee412a@ti.com
> 
> Grygorii can you test this?

Thanks.
I do not see this trace any more and networking is working after if down/up

Tested-by: Grygorii Strashko <grygorii.strashko@...com>


-- 
Best regards,
grygorii