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

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Date:	Tue, 17 Feb 2015 14:24:51 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	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
CC:	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 02/16/15 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>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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