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Date:   Sun, 24 Oct 2021 12:54:52 +0300
From:   Leon Romanovsky <leon@kernel.org>
To:     Ido Schimmel <idosch@idosch.org>
Cc:     "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Ido Schimmel <idosch@mellanox.com>,
        Jiri Pirko <jiri@mellanox.com>, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org,
        syzbot+93d5accfaefceedf43c1@syzkaller.appspotmail.com
Subject: Re: [PATCH net-next] netdevsim: Register and unregister devlink
 traps on probe/remove device
Message-ID: <YXUtbOpjmmWr71dU@unreal>
References: <725e121f05362da4328dda08d5814211a0725dac.1635064599.git.leonro@nvidia.com>
 <YXUhyLXsc2egWNKx@shredder>
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On Sun, Oct 24, 2021 at 12:05:12PM +0300, Ido Schimmel wrote:
> On Sun, Oct 24, 2021 at 11:42:11AM +0300, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@nvidia.com>
> > 
> > Align netdevsim to be like all other physical devices that register and
> > unregister devlink traps during their probe and removal respectively.
> 
> No, this is incorrect. Out of the three drivers that support both reload
> and traps, both netdevsim and mlxsw unregister the traps during reload.
> Here is another report from syzkaller about mlxsw [1].

Sorry, I overlooked it.

> 
> Please revert both 22849b5ea595 ("devlink: Remove not-executed trap
> policer notifications") and 8bbeed485823 ("devlink: Remove not-executed
> trap group notifications").

However, before we rush and revert commit, can you please explain why
current behavior to reregister traps on reload is correct?

I think that you are not changing traps during reload, so traps before
reload will be the same as after reload, am I right?

Thanks