netdev - Re: [PATCH] net/smc: loop in smc

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Message-ID: <YZtW2cOyFLosjVjL@TonyMac-Alibaba>
Date:   Mon, 22 Nov 2021 16:37:45 +0800
From:   Tony Lu <tonylu@...ux.alibaba.com>
To:     Daxing Guo <guodaxing@...wei.com>
Cc:     netdev@...r.kernel.org, chenzhe@...wei.com,
        linux-s390@...r.kernel.org, greg@...ah.com
Subject: Re: [PATCH] net/smc: loop in smc_listen

On Sat, Nov 20, 2021 at 03:54:51PM +0800, Daxing Guo wrote:
> From: Guo DaXing <guodaxing@...wei.com>
> 
> The kernel_listen function in smc_listen will fail when all the available
> ports are occupied.  At this point smc->clcsock->sk->sk_data_ready has 
> been changed to smc_clcsock_data_ready.  When we call smc_listen again, 
> now both smc->clcsock->sk->sk_data_ready and smc->clcsk_data_ready point 
> to the smc_clcsock_data_ready function.
> 
> The smc_clcsock_data_ready() function calls lsmc->clcsk_data_ready which 
> now points to itself resulting in an infinite loop.
> 
> This patch restores smc->clcsock->sk->sk_data_ready with the old value.
> 
> Signed-off-by: Guo DaXing <guodaxing@...wei.com>

It works in my testing environment, thanks.

Acked-by: Tony Lu <tonylu@...ux.alibaba.com>