linux-kernel - Re: [PATCH v2] hwmon: (scpi) skip unsupported sensors properly

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Date:	Wed, 28 Oct 2015 21:59:31 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	linux-kernel@...r.kernel.org,
	Punit Agrawal <punit.agrawal@....com>,
	lm-sensors@...sensors.org, Jean Delvare <jdelvare@...e.com>
Subject: Re: [PATCH v2] hwmon: (scpi) skip unsupported sensors properly

On Wed, Oct 28, 2015 at 05:17:31PM +0000, Sudeep Holla wrote:
> Currently it's assumed that firmware exports only the class of sensors
> supported by the driver. However with newer firmware or SCPI protocol
> revision, support for newer classes of sensors can be present.
> 
> The driver fails to probe with the following warning if an unsupported
> class of sensor is encountered in the firmware.
> 
> sysfs: cannot create duplicate filename
> 	'/devices/platform/scpi/scpi:sensors/hwmon/hwmon0/'
> ------------[ cut here ]------------
> WARNING: at fs/sysfs/dir.c:31
> Modules linked in:
> 
> CPU: 0 PID: 6 Comm: kworker/u12:0 Not tainted 4.3.0-rc7 #137
> Hardware name: ARM Juno development board (r0) (DT)
> Workqueue: deferwq deferred_probe_work_func
> PC is at sysfs_warn_dup+0x54/0x78
> LR is at sysfs_warn_dup+0x54/0x78
> 
> This patch fixes the above issue by skipping through the unsupported
> class of SCPI sensors.
> 
> Fixes: 68acc77a2d51 ("hwmon: Support thermal zones registration for SCP temperature sensors")
> Fixes: ea98b29a05e9 ("hwmon: Support sensors exported via ARM SCP interface")
> Cc: Guenter Roeck <linux@...ck-us.net>
> Reviewed-by: Punit Agrawal <punit.agrawal@....com>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/hwmon/scpi-hwmon.c | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)
> 
> Hi Guenter,
> 
> Either me/Punit will need ping you once the original driver is merged
> via arm-soc so that you can pick this after that. Alternatively we
> can push it via arm-soc but I wouldn't rush for that as it's not that
> urgent. Is that fine with you ?
> 
Either way is fine with me.

Guenter
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