linux-kernel - Re: [PATCH v4 03/13] clk: at91: remove IRQ handling and use polling

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Message-ID: <20160128083112.GJ12841@codeaurora.org>
Date:	Thu, 28 Jan 2016 00:31:12 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Michael Turquette <mturquette@...libre.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v4 03/13] clk: at91: remove IRQ handling and use polling

On 01/27, Alexandre Belloni wrote:
> The AT91 clock drivers make use of IRQs to avoid polling when waiting for
> some clocks to be enabled. Unfortunately, this leads to a crash when those
> IRQs are threaded (which happens when using preempt-rt) because they are
> registered before thread creation is possible.
> 
> Use polling on those clocks instead to avoid the problem.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> ---

Acked-by: Stephen Boyd <sboyd@...eaurora.org>

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