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To: "Jakub Kicinski" <>
Subject: Re: [PATCH net-next] net: sock: add the case if sk is NULL
Date: Mon, 09 Aug 2021 06:12:55 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

August 6, 2021 9:11 PM, "Jakub Kicinski" <> wrote:

> On Fri, 6 Aug 2021 14:38:15 +0800 Yajun Deng wrote:
>> Add the case if sk is NULL in sock_{put, hold},
>> The caller is free to use it.
>> Signed-off-by: Yajun Deng <>
> The obvious complaint about this patch (and your previous netdev patch)
> is that you're spraying branches everywhere in the code. Sure, it may

Sorry for that, I'll be more normative in later submission.
> be okay for free(), given how expensive of an operation that is but
> is having refcounting functions accept NULL really the best practice?
> Can you give us examples in the kernel where that's the case?

0   include/net/neighbour.h         neigh_clone()
1   include/linux/cgroup.h          get_cgroup_ns() and put_cgroup_ns()  (This is very similar to my submission)
2   include/linux/ipc_namespace.h   get_ipc_ns()
3   include/linux/posix_acl.h       posix_acl_dup()
4   include/linux/pid.h             get_pid()
5   include/linux/user_namespace.h  get_user_ns()

  parent reply	other threads:[~2021-08-09  6:13 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-06  6:38 Yajun Deng
2021-08-06 13:11 ` Jakub Kicinski
2021-08-09  6:12 ` yajun.deng [this message]
2021-08-09  9:34   ` Eric Dumazet
2021-08-09 10:28     ` Leon Romanovsky
2021-08-09  9:15 ` Eric Dumazet

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