linux-kernel - Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

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Date:   Mon, 13 Jan 2020 21:20:51 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bart Van Assche <bvanassche@....org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

Hi Martin,

On 1/13/20 7:03 PM, Martin K. Petersen wrote:
> 
> Hi Guenter!
> 
>> I tried again, this time with v5.5-rc5. Loading and unloading ahci and
>> drivetemp in any order does not cause any problems for me.
> 
> I tried your hwmon-next branch and it still happens for me. Both in qemu
> and on real hw. I'm really low on bandwidth the next couple of days.
> Will try to look later this week unless you beat me to it. I get lots of
> these warnings after modprobe drivetemp; modprobe ahci:
> 
> [ 1055.611922] WARNING: CPU: 3 PID: 3233 at drivers/base/dd.c:519 really_probe+0x436/0x4f0
> 
> A quick test forcing synchronous SCSI scanning made no difference.
> 

The hwmon-next branch is based on v5.5-rc1. It might be better to either
merge hwmon-next into mainline, or to apply the drivetemp patch to mainline,
and test the result. I have seen some (unrelated) weird tracebacks
in the driver core with v5.5-rc1, so that may not be the best baseline
for a test.

Thanks,
Guenter