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

From: Thomas Gleixner
Date: Tue Aug 25 2015 - 17:52:32 EST

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.



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