linux-kernel - Re: [PATCH v3 2/2] iio: twl6030-gpadc: TWL6030, TWL6032 GPADC driver

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Message-ID: <51E3DE21.9060105@metafoo.de>
Date:	Mon, 15 Jul 2013 13:33:53 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	"Kozaruk, Oleksandr" <oleksandr.kozaruk@...com>
CC:	"tony@...mide.com" <tony@...mide.com>,
	"benoit.cousson@...aro.org" <benoit.cousson@...aro.org>,
	"Nayak, Rajendra" <rnayak@...com>,
	"Ujfalusi, Peter" <peter.ujfalusi@...com>,
	"ABRAHAM, KISHON VIJAY" <kishon@...com>,
	"jic23@....ac.uk" <jic23@....ac.uk>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"ch.naveen@...sung.com" <ch.naveen@...sung.com>,
	"poeschel@...onage.de" <poeschel@...onage.de>,
	"Kim, Milo" <Milo.Kim@...com>,
	"Krishnamoorthy, Balaji T" <balajitk@...com>,
	"gg@...mlogic.co.uk" <gg@...mlogic.co.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] iio: twl6030-gpadc: TWL6030, TWL6032 GPADC driver

On 07/15/2013 01:09 PM, Kozaruk, Oleksandr wrote:
[...]
> 
>>> +     ret = devm_request_threaded_irq(dev, irq, NULL,
>>> +                                     twl6030_gpadc_irq_handler,
>>> +                                     IRQF_ONESHOT, "twl6030_gpadc", gpadc);
>>
>> You access memory in the interrupt handler which is freed before the interrupt
>> handler is freed.
> Thanks for pointing this. devm_* will free memory for irq after the driver
> is removed and memory for the device is freed. I took me awhile to understand
> this. Is there going to be something like devm_iio_device_alloc? whould it be helpfull?
> 

Yes, I think it certainly makes sense to add a devm_iio_device_alloc(), care
to send a patch?
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