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

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Message-ID: <20150831212844.GI13774@localhost.localdomain>
Date:	Mon, 31 Aug 2015 23:28:44 +0200
From:	Anders Roxell <anders.roxell@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
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 2015-08-25 23:51, Thomas Gleixner wrote:
> 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.

You are right, I will send a v2 with a better changelog.

Cheers,
Anders
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