netdev - Re: [PATCH net] net:sysctl fix the confusing corner of tcp

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Date:	Wed, 9 Dec 2015 16:47:34 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Wang Yufen <wangyufen@...wei.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Cc:	guohanjun@...wei.com, zhangdianfang@...wei.com,
	dingtianhong@...wei.com, huxinwei@...wei.com,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH net] net:sysctl fix the confusing corner of tcp_mem

Hello.

On 12/9/2015 5:01 AM, Wang Yufen wrote:

> From: Yufen Wang <wangyufen@...wei.com>
>
> I tried on linux-4.1:
>      linux:~# cat /proc/sys/net/ipv4/tcp_mem
>      8388608	12582912	16777216
>      linux:~# echo 1234 >/proc/sys/net/ipv4/tcp_mem
>      -bash: echo: write error: Invalid argument
>      linux:~# cat /proc/sys/net/ipv4/tcp_mem
>      1234	12582912	16777216
>
> the echo operation got error, but value already written to tcp_mem.
> If a write() returns an error like EINVAL, we expect no change occurred.
> This patch fix the confusing corner and makes __do_proc_doulongvec_minmax
> works the same as __do_proc_dointvec
>
> Signed-off-by: Yufen Wang <wangyufen@...wei.com>
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>   kernel/sysctl.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index c3eee4c..e3ee4be 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -2318,6 +2318,8 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
>   			bool neg;
>
>   			left -= proc_skip_spaces(&kbuf);
> +                        if (!left)
> +                                break;

     Please use tabs for indentation, not spaces.

[...]

MBR, Sergei

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