netdev - Re: [PATCH net] Revert "fib_rules: return 0 directly if an exactly same rule exists when NLM_F

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Date:   Tue, 4 Jun 2019 22:44:02 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        zenczykowski@...il.com, Lorenzo Colitti <lorenzo@...gle.com>,
        David Miller <davem@...emloft.net>,
        David Ahern <dsa@...ulusnetworks.com>,
        Thomas Haller <thaller@...hat.com>,
        Yaro Slav <yaro330@...il.com>
Subject: Re: [PATCH net] Revert "fib_rules: return 0 directly if an exactly
 same rule exists when NLM_F_EXCL not supplied"

On Wed, Jun 05, 2019 at 12:27:14PM +0800, Hangbin Liu wrote:
> This reverts commit e9919a24d3022f72bcadc407e73a6ef17093a849.
> 
> Nathan reported the new behaviour breaks Android, as Android just add
> new rules and delete old ones.
> 
> If we return 0 without adding dup rules, Android will remove the new
> added rules and causing system to soft-reboot.
> 
> Reported-by: Nathan Chancellor <natechancellor@...il.com>
> Fixes: e9919a24d302 ("fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
Tested-by: Nathan Chancellor <natechancellor@...il.com>

I verified a revert on my OP6 when I initially ran into this issue.

Thanks for this. I would recommend that Yaro and Maciej also be given
reported by credit as I am not the only one to bring this up :)

Cheers,
Nathan