linux-kernel - Re: [PATCH] drivers: i2c: exynos5: irq spinlock rt-safe

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Message-ID: <alpine.DEB.2.11.1508252349070.15006@nanos>
Date:	Tue, 25 Aug 2015 23:51:50 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Anders Roxell <anders.roxell@...aro.org>
cc:	kgene@...nel.org, k.kozlowski@...sung.com, wsa@...-dreams.de,
	ch.naveen@...sung.com, linux-i2c@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	khilman@...aro.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH] drivers: i2c: exynos5: irq spinlock rt-safe

On Tue, 25 Aug 2015, Anders Roxell wrote:

> The exynos5_i2c_message_start enables interrupts while holding the i2c
> lock which is sought by the irq handler. If an IRQ is received before
> this lock is released then a deadlock occurs.

That's crap. The interrupt handler runs in an irq thread as RT forces
all normal interrupts to that.

Thanks,

	tglx

 
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