[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAJZ5v0jgvfzN+Ug9G_gLV=NXLvfmuC98XzjLes709g2uypQ5nA@mail.gmail.com>
Date: Fri, 11 Aug 2023 18:55:19 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Zhang Rui <rui.zhang@...el.com>
Cc: rafael.j.wysocki@...el.com, daniel.lezcano@...aro.or,
srinivas.pandruvada@...el.com, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH] thermal: intel: intel_soc_dts_iosf: Fix thermal_zone removal
On Fri, Aug 11, 2023 at 10:45 AM Zhang Rui <rui.zhang@...el.com> wrote:
>
> All of the existing callers of remove_dts_thermal_zone() pass a valid
> pointer as the argument, so checking for the NULL pointer is redundant.
True.
> Plus, when calling remove_dts_thermal_zone() from
> intel_soc_dts_iosf_init(), it is possible that
> 1. dts->tzone is an error pointer, when the sensor fails to be
> registered as a valid thermal zone
> 2. dts->tzone is unregistered in add_dts_thermal_zone(), when some
> failure occurs after thermal zone registered
> In both cases, there is no need to unregister dts->tzone in
> remove_dts_thermal_zone().
>
> Clear dst->tzone when add_dts_thermal_zone() fails. And do thermal zone
> removal in remove_dts_thermal_zone() only when dts->tzone is set.
Well, I'm not sure.
thermal_zone_device_unregister() will do nothing if the thermal zone
is not really registered AFAICS and it is prudent to restore
SOC_DTS_OFFSET_ENABLE on failure IMO.
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> ---
> drivers/thermal/intel/intel_soc_dts_iosf.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/intel/intel_soc_dts_iosf.c b/drivers/thermal/intel/intel_soc_dts_iosf.c
> index 7a66d0f077b0..c5203ba8f0b9 100644
> --- a/drivers/thermal/intel/intel_soc_dts_iosf.c
> +++ b/drivers/thermal/intel/intel_soc_dts_iosf.c
> @@ -212,7 +212,7 @@ static int soc_dts_enable(int id)
>
> static void remove_dts_thermal_zone(struct intel_soc_dts_sensor_entry *dts)
> {
> - if (dts) {
> + if (dts->tzone) {
> iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
> SOC_DTS_OFFSET_ENABLE, dts->store_status);
> thermal_zone_device_unregister(dts->tzone);
> @@ -277,6 +277,7 @@ static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
> err_enable:
> thermal_zone_device_unregister(dts->tzone);
> err_ret:
> + dts->tzone = NULL;
> return ret;
> }
>
> --
> 2.34.1
>
Powered by blists - more mailing lists