linux-kernel - Re: [PATCH] rtc-tegra: properly initialize spinlock

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Message-Id: <58E25CAF-EAC4-4613-81B2-D713F5DC8CEF@gmail.com>
Date:	Fri, 22 Jul 2011 16:19:19 -0700
From:	Sven-Thorsten Dietrich <thebigcorporation@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Andrew Chew <achew@...dia.com>,
	linux-rt-users@...r.kernel.org,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-kernel@...r.kernel.org, jkastner@...hat.com
Subject: Re: [PATCH] rtc-tegra: properly initialize spinlock


On Jul 22, 2011, at 3:13 PM, Andrew Morton wrote:

> On Fri, 22 Jul 2011 10:35:56 +0200
> Uwe Kleine-K__nig <u.kleine-koenig@...gutronix.de> wrote:
> 
>> Using __SPIN_LOCK_UNLOCKED for a dynamically allocated lock is wrong and
>> breaks with PREEMPT_RT_FULL.
> 
> Please define "breaks".  Lockdep warnings?  Deadlocks?

Narrr, I think its a compile-time problem with the static initializer.

Sven

> 
>> diff --git a/drivers/rtc/rtc-tegra.c b/drivers/rtc/rtc-tegra.c
>> index 2fc31aa..75259fe 100644
>> --- a/drivers/rtc/rtc-tegra.c
>> +++ b/drivers/rtc/rtc-tegra.c
>> @@ -343,7 +343,7 @@ static int __devinit tegra_rtc_probe(struct platform_device *pdev)
>> 
>> 	/* set context info. */
>> 	info->pdev = pdev;
>> -	info->tegra_rtc_lock = __SPIN_LOCK_UNLOCKED(info->tegra_rtc_lock);
>> +	spin_lock_init(&info->tegra_rtc_lock);
>> 
>> 	platform_set_drvdata(pdev, info);
>> 
>> -- 
>> 1.7.5.4
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