netdev - Re: [PATCH net] ipv4: disable BH in set_ping_group

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Message-ID: <CAM_iQpV-00gemayMkdLGzb8wo8CNimOZQHDXrvH1jeN6Svrs8w@mail.gmail.com>
Date:   Thu, 20 Oct 2016 12:44:02 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, Eric Salo <salo@...gle.com>
Subject: Re: [PATCH net] ipv4: disable BH in set_ping_group_range()

On Thu, Oct 20, 2016 at 12:40 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Thu, Oct 20, 2016 at 12:32 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> On Thu, Oct 20, 2016 at 10:26 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>>> From: Eric Dumazet <edumazet@...gle.com>
>>>
>>> In commit 4ee3bd4a8c746 ("ipv4: disable BH when changing ip local port
>>> range") Cong added BH protection in set_local_port_range() but missed
>>> that same fix was needed in set_ping_group_range()
>>
>> Don't know why ping_group_range shares the same lock with local_port_range...
>> Perhaps just for saving a few bytes, but that is why I missed this place.
>
> Hold on... We clearly have typos there... Your fix is not correct.

We need the attached patch, your patch should be reverted, because
unlike local_port_range we never read it in BH context, no need to bother _bh.

View attachment "ping.diff" of type "text/plain" (1211 bytes)