linux-kernel - watchdog: iTCO_wdt: cannot register miscdev on minor=130 (err=-16).

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Message-ID: <a6e0f876-3a0f-49fd-7f45-715e75b6a779@molgen.mpg.de>
Date:   Tue, 26 May 2020 13:21:42 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        it+linux-watchdog@...gen.mpg.de
Subject: watchdog: iTCO_wdt: cannot register miscdev on minor=130 (err=-16).

Dear Linux folks,

Linux 5.4.39 reports the watchdog messages below on a Dell PowerEdge 
T630 with 12x E5-2603 v4 @ 1.70GHz.

     DMI: Dell Inc. PowerEdge T630/0NT78X, BIOS 2.5.4 08/17/2017

```
handsomejack:~$ more /proc/version
Linux version 5.4.39.mx64.334 (root@....molgen.mpg.de) (gcc version 
7.5.0 (GCC)) #1 SMP Thu May 7 14:27:50 CEST 2020
handsomejack:~$ grep TCO /boot/config-5.4.39.mx64.334
CONFIG_NETCONSOLE=m
CONFIG_NETCONSOLE_DYNAMIC=y
# CONFIG_SP5100_TCO is not set
CONFIG_ITCO_WDT=y
CONFIG_ITCO_VENDOR_SUPPORT=y
CONFIG_NV_TCO=y
# CONFIG_INTEL_SMARTCONNECT is not set
# CONFIG_EXTCON is not set
handsomejack:~$ dmesg --level=err
[   11.618887] watchdog: iTCO_wdt: cannot register miscdev on minor=130 
(err=-16).
[   11.627956] watchdog: iTCO_wdt: a legacy watchdog module is probably 
present.
handsomejack:~$ dmesg | grep -e iTCO -e watchdog
[   11.603138] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11
[   11.609888] iTCO_wdt: Found a Wellsburg TCO device (Version=2, 
TCOBASE=0x0460)
[   11.618887] watchdog: iTCO_wdt: cannot register miscdev on minor=130 
(err=-16).
[   11.627956] watchdog: iTCO_wdt: a legacy watchdog module is probably 
present.
[   11.636462] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0)
[   11.643679] iTCO_vendor_support: vendor-support=0
handsomejack:~$ ls -l /dev/watchdog
crw------- 1 root root 10, 130 May 26 11:40 /dev/watchdog
```

Together the error and success messages are from the same module are 
confusing me a little. How can I find out the legacy watchdog module?

Kind regards,

Paul