linux-kernel - Re: [PATCH 0/8] power_supply: Add API for safe access of get

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Message-id: <543DDA4D.2060103@samsung.com>
Date:	Wed, 15 Oct 2014 11:22:05 +0900
From:	jonghwa3.lee@...sung.com
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, Anton Vorontsov <anton@...msg.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Pavel Machek <pavel@....cz>,
	Myungjoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH 0/8] power_supply: Add API for safe access of
 get_property-like function attrs

Hi,
On 2014년 10월 14일 21:20, Krzysztof Kozlowski wrote:

> Hi,
> 
> 
> After fixing issue with referencing old power supply after driver
> unbind in charger manager [1] I noticed that the race condition in such
> case may still exist. It would be harder to trigger but still possible.
> 
> The race is between using a reference to power supply (obtained
> with power_supply_get_by_name()) and removing the driver.
> 
> This patchset aims to fix the race by introducing wrappers for
> accessing the power supply function attributes.
> 
> Patch 1 introduces new API. Other patches replace direct calls in
> drivers.
> 
> Rebased on next-20141007.
> Tested on Trats2 board (max77693 + charger manager).
> 
> 
> Kindly asking for reviewing/testing the drivers, although the changes
> are straightforward.
> 


Looks good to me, but need someone to comment on this.

Acked-by : Jonghwa Lee <jonghwa3.lee@...usng.com>

Thanks,
Jonghwa

> 
> Best regards,
> Krzysztof
> 
> 
> [1] https://lkml.org/lkml/2014/10/13/272
> 
> 
> 
> Krzysztof Kozlowski (8):
>   power_supply: Add API for safe access of power supply function attrs
>   power_supply: sysfs: Use power_supply_*() API for accessing function
>     attrs
>   power: 88pm860x_charger: Use power_supply_*() API for accessing
>     function attrs
>   power: ab8500: Use power_supply_*() API for accessing function attrs
>   mfd: ab8500: Use power_supply_*() API for accessing function attrs
>   power: apm_power: Use power_supply_*() API for accessing function
>     attrs
>   power: bq2415x_charger: Use power_supply_*() API for accessing
>     function attrs
>   power: charger-manager: Use power_supply_*() API for accessing
>     function attrs
> 
>  drivers/mfd/ab8500-sysctrl.c       |  7 +++--
>  drivers/power/88pm860x_charger.c   | 13 +++++----
>  drivers/power/ab8500_btemp.c       |  2 +-
>  drivers/power/ab8500_charger.c     |  2 +-
>  drivers/power/ab8500_fg.c          |  2 +-
>  drivers/power/abx500_chargalg.c    |  4 +--
>  drivers/power/apm_power.c          |  4 +--
>  drivers/power/bq2415x_charger.c    |  3 +-
>  drivers/power/charger-manager.c    | 37 +++++++++++++------------
>  drivers/power/power_supply_core.c  | 57 ++++++++++++++++++++++++++++++++++++--
>  drivers/power/power_supply_sysfs.c |  6 ++--
>  include/linux/power_supply.h       | 16 +++++++++++
>  12 files changed, 115 insertions(+), 38 deletions(-)
> 


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