linux-kernel - Re: [PATCH] ARM: EXYNOS: Don't use LDREX and STREX after disabling cache coherency

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Message-ID: <54EF87A4.6090609@kernel.org>
Date:	Fri, 27 Feb 2015 05:52:52 +0900
From:	Kukjin Kim <kgene@...nel.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH] ARM: EXYNOS: Don't use LDREX and STREX after disabling
 cache coherency

On 02/18/15 07:24, Stephen Boyd wrote:
> On 02/16/15 05:36, Krzysztof Kozlowski wrote:
>> During CPU shutdown the exynos_cpu_power_down() is called after
>> disabling cache coherency and it uses LDREX and STREX instructions (by
>> calling of_machine_is_compatible() -> kobject_get() -> kref_get()).
>>
>> The LDREX and STREX should not be used after disabling the cache
>> coherency so just use soc_is_exynos().
>>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>> Fixes: adc548d77c22 ("ARM: EXYNOS: Use MCPM call-backs to support S2R on exynos5420")
>> Cc: <stable@...r.kernel.org>
>> Reported-by: Stephen Boyd <sboyd@...eaurora.org>
>> ---
> 
> Looks good to me.
> 
> Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>
> 
Thanks for this fix, applied.

- Kukjin
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