linux-kernel - Re: [PATCH 00/15] thermal: sysfs: add locking

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Date:	Wed, 1 Jun 2016 09:26:46 +0530
From:	Keerthy <a0393675@...com>
To:	Eduardo Valentin <edubezval@...il.com>,
	Rui Zhang <rui.zhang@...el.com>
CC:	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/15] thermal: sysfs: add locking



On Tuesday 31 May 2016 12:01 PM, Eduardo Valentin wrote:
> Hello,
>
> Several thermal sysfs entries are currently being called
> from userspace without locking. Data and calls to ops
> are accessed deliberated without any care for locking.
>
> This patch series attempts to fix this.
>
> Now that sysfs handlers are on the same place it is easier
> to visualize this issue and fix it. The strategy is essentially
> to lock any access. Also, functions in thermal core and thermal
> helpers are assumed to do the proper locking already.
>
> This patch series is based on the thermal core reorganization.
>
> There is no change in the ABI to userspace. The difference
> is that now serialization to data will be done.
>
> For your consideration, I am also adding this to this branch:
>    git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal sysfs_locking

Tested and checked for reading temperatures from all the thermal zones
on DRA7/DRA72 and AM57XX-BEAGLE-X15 boards.

Also tested emulation using a rebased version of
https://lkml.org/lkml/2016/5/10/346

For DRA7/DRA72 and BEAGLE-X15:
Tested-by: Keerthy <j-keerthy@...com>

>
> Comments are welcome.
>
> BR,
>
> Eduardo Valentin (15):
>    thermal: sysfs: lock tz in type_show
>    thermal: sysfs: lock tz while on access to mode properties
>    thermal: sysfs: lock tz while on trip_point_type properties
>    thermal: sysfs: lock tz while on trip_point_temp properties
>    thermal: sysfs: lock tz while on trip_point_hyst properties
>    thermal: sysfs: lock tz while on passive properties
>    thermal: sysfs: lock tz while on policy properties
>    thermal: sysfs: improve locking of emul_temp_store()
>    thermal: sysfs: lock tz when access sustainable power properties
>    thermal: sysfs: lock tz when access tzp properties
>    thermal: sysfs: lock cdev while accessing type
>    thermal: sysfs: lock cdev while accessing max_state
>    thermal: sysfs: lock cdev while accessing cur_state
>    thermal: sysfs: serialize access to instances
>    thermal: sysfs: add comments describing locking strategy
>
>   drivers/thermal/thermal_sysfs.c | 133 ++++++++++++++++++++++++++++++++++------
>   include/linux/thermal.h         |   2 +-
>   2 files changed, 115 insertions(+), 20 deletions(-)
>