linux-kernel - Re: [PATCHv4 6/7] hwspinlock/omap: enable module before reading SYSSTATUS register

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Date:	Tue, 14 Jan 2014 10:56:26 -0600
From:	"Anna, Suman" <s-anna@...com>
To:	<balbi@...com>
CC:	Ohad Ben-Cohen <ohad@...ery.com>,
	Mark Rutland <mark.rutland@....com>,
	Tony Lindgren <tony@...mide.com>,
	Kumar Gala <galak@...eaurora.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv4 6/7] hwspinlock/omap: enable module before reading SYSSTATUS
 register

Felipe,

On 01/14/2014 08:04 AM, Felipe Balbi wrote:
> Hi again,
>
> On Tue, Jan 14, 2014 at 07:10:52AM -0600, Felipe Balbi wrote:
>>> diff --git a/drivers/hwspinlock/omap_hwspinlock.c b/drivers/hwspinlock/omap_hwspinlock.c
>>> index 9f56fb2..194886e 100644
>>> --- a/drivers/hwspinlock/omap_hwspinlock.c
>>> +++ b/drivers/hwspinlock/omap_hwspinlock.c
>>> @@ -101,10 +101,23 @@ static int omap_hwspinlock_probe(struct platform_device *pdev)
>>>   	if (!io_base)
>>>   		return -ENOMEM;
>>>
>>> +	/*
>>> +	 * make sure the module is enabled and clocked before reading
>>> +	 * the module SYSSTATUS register
>>> +	 */
>>> +	pm_runtime_enable(&pdev->dev);
>>> +	pm_runtime_get_sync(&pdev->dev);
>
> another thing, you need to check return of pm_runtime_get_sync()

OK, let me check this and your other comment, and the fix is probably a 
separate patch.

regards
Suman

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