linux-kernel - Re: [PATCH V2] regulator: fixed: update to devm

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Date:	Tue, 28 Jan 2014 08:38:10 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Manish Badarkhe <badarkhe.manish@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-omap@...r.kernel.org,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>, linux-tegra@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH V2] regulator: fixed: update to devm_* API

On Tuesday, 28. January 2014 12:46:01 Manish Badarkhe wrote:
> Hi Dmitry,
> 
> Thank you for your review.
> 
> On Tue, Jan 28, 2014 at 12:03 PM, Dmitry Torokhov
> 
> <dmitry.torokhov@...il.com> wrote:
> > Hi Manish,
> > 
> > On Tue, Jan 28, 2014 at 08:42:00AM +0530, Manish Badarkhe wrote:
> >> Update the code to use devm_* API so that driver core will manage
> >> resources.
> >> 
> >> Signed-off-by: Manish Badarkhe <badarkhe.manish@...il.com>
> >> ---
> >> Changes since V1:
> >> 1. Updated driver to use "devm_kzalloc" to "kstrdup".
> >> 2. Updated commit message.
> >> 
> >> Not tested on any board.
> >> 
> >> :100644 100644 5ea64b9... e9763a4... M        drivers/regulator/fixed.c
> >> :
> >>  drivers/regulator/fixed.c |   42
> >>  ++++++++++++------------------------------
> >>  1 file changed, 12 insertions(+), 30 deletions(-)
> >> 
> >> diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
> >> index 5ea64b9..e9763a4 100644
> >> --- a/drivers/regulator/fixed.c
> >> +++ b/drivers/regulator/fixed.c
> >> @@ -132,15 +132,15 @@ static int reg_fixed_voltage_probe(struct
> >> platform_device *pdev)>> 
> >>                              GFP_KERNEL);
> >>       
> >>       if (drvdata == NULL) {
> >>       
> >>               dev_err(&pdev->dev, "Failed to allocate device data\n");
> >> 
> >> -             ret = -ENOMEM;
> >> -             goto err;
> >> +             return -ENOMEM;
> >> 
> >>       }
> >> 
> >> -     drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
> >> +     drvdata->desc.name = devm_kzalloc(&pdev->dev,
> >> +                                       strlen(config->supply_name) + 1,
> >> +                                       GFP_KERNEL);
> >> 
> >>       if (drvdata->desc.name == NULL) {
> >>       
> >>               dev_err(&pdev->dev, "Failed to allocate supply name\n");
> >> 
> >> -             ret = -ENOMEM;
> >> -             goto err;
> >> +             return -ENOMEM;
> >> 
> >>       }
> > 
> > Umm, I am fairly certain that devm_kzalloc() can't be used as a
> > substitute for kstrdup, at least not without accompanying memcpy.
> 
> Yes, I have provided allocation but it should be followed with assignment.
> Can I modify like this,
> 
> +     drvdata->desc.name = devm_kzalloc(&pdev->dev,
> +                                       strlen(config->supply_name) + 1,
> +                                       GFP_KERNEL);
> +     if (drvdata->desc.name)
> +     sprintf(drvdata->desc.name, "%s", config->supply_name);

hmm, so you replaced a general helper function by open coding the string-
duplication. Doesn't this defeat the target of simplifying the code?


Heiko

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