linux-kernel - Re: Locking in the clk API

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Message-ID: <4D423823.4070009@codeaurora.org>
Date:	Thu, 27 Jan 2011 19:29:39 -0800
From:	Saravana Kannan <skannan@...eaurora.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-sh <linux-sh@...r.kernel.org>,
	Ben Herrenschmidt <benh@...nel.crashing.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Colin Cross <ccross@...gle.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Richard Zhao <linuxzsc@...il.com>
Subject: Re: Locking in the clk API

On 01/27/2011 01:07 PM, Alan Cox wrote:
>>> For internal tree purposes, does .set_termios need to be atomic? Can it
>>> grab mutexes instead of spinlock?
>>
>> I think I already answered that question above where I said "protect
>> against the interrupt handler accessing the port->* stuff".
>
> I'm not sure you answered it correctly however as the locking nowdays is
> a bit different.
>
> Architecturally the termios handling doesn't need a spin lock nor is it
> called under one. In fact it's vital this is the case because of USB.

Thanks for the clarification Alan. This is what I was looking for.

-Saravana

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