netdev - Re: [PATCH] lib/dynamic_queue_limits.c: relax BUG_ON to WARN_ON in dql

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Message-ID: <CAKv+Gu_Eg-WD-ej7_KpDTWjYm4KrrJkELTxkNkBdE8a1A2Ht3A@mail.gmail.com>
Date:   Thu, 19 Oct 2017 12:14:26 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     David Miller <davem@...emloft.net>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>
Subject: Re: [PATCH] lib/dynamic_queue_limits.c: relax BUG_ON to WARN_ON in dql_complete()

On 19 October 2017 at 11:57, David Miller <davem@...emloft.net> wrote:
> From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Date: Wed, 18 Oct 2017 16:45:15 +0100
>
>> Even though calling dql_completed() with a count that exceeds the
>> queued count is a serious error, it still does not justify bringing
>> down the entire kernel with a BUG_ON(). So relax it to a WARN_ON()
>> instead.
>>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>
> This is bogus.
>
> Unless you are going to do all of the work necessary to fix
> the out-of-bounds condition here, you cannot safely continue
> into the rest of this function.
>
> Things are going to explode in many places if you don't, at
> a minimum, fix the 'count' value to be in range.
>
> But like others I don't like this, the driver needs to be fixed
> urgently if this condition triggers.
>
> Sorry I'm not applying this.

Fair enough.