linux-kernel - RE: [PATCH 07/11] mfd: menelaus: use devm_request_irq() and devm

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Message-id: <000801ce0f41$00e79170$02b6b450$%han@samsung.com>
Date:	Wed, 20 Feb 2013 17:05:10 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Dmitry Torokhov' <dmitry.torokhov@...il.com>
Cc:	'Samuel Ortiz' <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, 'Jingoo Han' <jg1.han@...sung.com>
Subject: RE: [PATCH 07/11] mfd: menelaus: use devm_request_irq() and
 devm_kzalloc()

On Wednesday, February 20, 2013 4:31 PM, Dmitry Torokhov wrote:
> 
> Hi Jongoo,
> 
> On Wed, Feb 20, 2013 at 03:12:38PM +0900, Jingoo Han wrote:
> > Use devm_request_irq() and devm_kzalloc() to make cleanup paths
> > more simple.
> >
> 
> ...
> 
> > @@ -1269,9 +1266,7 @@ static int __exit menelaus_remove(struct i2c_client *client)
> >  {
> >  	struct menelaus_chip	*menelaus = i2c_get_clientdata(client);
> >
> > -	free_irq(client->irq, menelaus);
> >  	flush_work(&menelaus->work);
> > -	kfree(menelaus);
> >  	the_menelaus = NULL;
> >  	return 0;
> 
> This conversion is certainly wrong - you really want to disable IRQ and
> then wait for the scheduled work to finish before freeing memory. Here
> you flush work but nothing stops IRQ from firing and scheduling that
> work again.

Yes, you're right. 
I will use devm_free_irq() before flush_work().

> 
> Please, be *extra* careful with devm_request_irq() conversions.
> 
> Thanks.
> 
> --
> Dmitry

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