linux-kernel - Re: [PATCH net 2/5] net/ncsi: Stop monitor if channel times out or is inactive

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Date:   Sat, 21 Oct 2017 01:57:03 +0100 (WEST)
From:   David Miller <davem@...emloft.net>
To:     sam@...dozajonas.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/5] net/ncsi: Stop monitor if channel times out or
 is inactive

From: Samuel Mendoza-Jonas <sam@...dozajonas.com>
Date: Thu, 19 Oct 2017 13:43:06 +1100

> ncsi_channel_monitor() misses stopping the channel monitor in several
> places that it should, causing a WARN_ON_ONCE() to trigger when the
> monitor is re-started later, eg:
> 
> [  459.040000] WARNING: CPU: 0 PID: 1093 at net/ncsi/ncsi-manage.c:269 ncsi_start_channel_monitor+0x7c/0x90
> [  459.040000] CPU: 0 PID: 1093 Comm: kworker/0:3 Not tainted 4.10.17-gaca2fdd #140
> [  459.040000] Hardware name: ASpeed SoC
> [  459.040000] Workqueue: events ncsi_dev_work
> [  459.040000] [<80010094>] (unwind_backtrace) from [<8000d950>] (show_stack+0x20/0x24)
> [  459.040000] [<8000d950>] (show_stack) from [<801dbf70>] (dump_stack+0x20/0x28)
> [  459.040000] [<801dbf70>] (dump_stack) from [<80018d7c>] (__warn+0xe0/0x108)
> [  459.040000] [<80018d7c>] (__warn) from [<80018e70>] (warn_slowpath_null+0x30/0x38)
> [  459.040000] [<80018e70>] (warn_slowpath_null) from [<803f6a08>] (ncsi_start_channel_monitor+0x7c/0x90)
> [  459.040000] [<803f6a08>] (ncsi_start_channel_monitor) from [<803f7664>] (ncsi_configure_channel+0xdc/0x5fc)
> [  459.040000] [<803f7664>] (ncsi_configure_channel) from [<803f8160>] (ncsi_dev_work+0xac/0x474)
> [  459.040000] [<803f8160>] (ncsi_dev_work) from [<8002d244>] (process_one_work+0x1e0/0x450)
> [  459.040000] [<8002d244>] (process_one_work) from [<8002d510>] (worker_thread+0x5c/0x570)
> [  459.040000] [<8002d510>] (worker_thread) from [<80033614>] (kthread+0x124/0x164)
> [  459.040000] [<80033614>] (kthread) from [<8000a5e8>] (ret_from_fork+0x14/0x2c)
> 
> This also updates the monitor instead of just returning if
> ncsi_xmit_cmd() fails to send the get-link-status command so that the
> monitor properly times out.
> 
> Fixes: e6f44ed6d04d3 "net/ncsi: Package and channel management"
> 
> Signed-off-by: Samuel Mendoza-Jonas <sam@...dozajonas.com>

Applied.