linux-kernel - Re: [PATCH] power_supply: Adjust devm usage

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Message-ID: <20150724125951.GA25447@earth>
Date:	Fri, 24 Jul 2015 14:59:51 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Vaishali Thakkar <vthakkar1994@...il.com>
Cc:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power_supply: Adjust devm usage

Hi,

On Fri, Jul 24, 2015 at 06:03:38PM +0530, Vaishali Thakkar wrote:
> On Fri, Jul 24, 2015 at 5:56 PM, Sebastian Reichel <sre@...nel.org> wrote:
> > On Fri, Jul 24, 2015 at 05:28:13PM +0530, Vaishali Thakkar wrote:
> >> @@ -267,8 +267,9 @@ static int bq24735_charger_probe() {}
> >> [...]
> >
> > Your patch is missing removal of the
> > kfree(charger->charger_desc.name) in bq24735_charger_remove().
> 
> Yes. Because it seems that this kfree is freeing some other data which
> is not related to devm_kzalloc. I was not sure about removing it.
> So, I was about to discuss it in a separate thread.s

it's assigned in the probe function:

    name = kasprintf(...);
    ...
    supply_desc->name = name;
    ...
    power_supply_register(..., supply_desc, ...);


> Also, in the remove function we have devm_free_irq. I am unsure it
> too. Because normally remove functions do not use devm
> counterparts.

It's required to free the irq before removing the power supply
device.

If the power supply is registered with devm, that should happen
automatically, since it is requested before the irq.  Thus the
remove function can be removed completely at that point :)

-- Sebastian

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