linux-kernel - Re: [PATCH] tvp7002: use devm_kzalloc() instead of kzalloc()

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Date:	Thu, 3 Jan 2013 19:03:43 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	davinci-linux-open-source@...ux.davincidsp.com,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	LKML <linux-kernel@...r.kernel.org>,
	LMML <linux-media@...r.kernel.org>
Subject: Re: [PATCH] tvp7002: use devm_kzalloc() instead of kzalloc()

Hi Laurent,

Thanks for the quick review!

On Thu, Jan 3, 2013 at 7:02 PM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> On Thursday 03 January 2013 14:31:20 Laurent Pinchart wrote:
>> On Thursday 03 January 2013 18:52:42 Lad, Prabhakar wrote:
>> > I2C drivers can use devm_kzalloc() too in their .probe() methods. Doing so
>> > simplifies their clean up paths.
>> >
>> > Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
>> > Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
>> > ---
>> >
>> >  drivers/media/i2c/tvp7002.c |   10 ++--------
>> >  1 files changed, 2 insertions(+), 8 deletions(-)
>> >
>> > diff --git a/drivers/media/i2c/tvp7002.c b/drivers/media/i2c/tvp7002.c
>> > index fb6a5b5..2d4c86e 100644
>> > --- a/drivers/media/i2c/tvp7002.c
>> > +++ b/drivers/media/i2c/tvp7002.c
>> > @@ -1036,7 +1036,7 @@ static int tvp7002_probe(struct i2c_client *c, const
>> > struct i2c_device_id *id) return -ENODEV;
>> >
>> >     }
>> >
>> > -   device = kzalloc(sizeof(struct tvp7002), GFP_KERNEL);
>> > +   device = devm_kzalloc(&c->dev, sizeof(struct tvp7002), GFP_KERNEL);
>> >
>> >     if (!device)
>> >
>> >             return -ENOMEM;
>> >
>> > @@ -1088,17 +1088,12 @@ static int tvp7002_probe(struct i2c_client *c,
>> > const struct i2c_device_id *id) V4L2_CID_GAIN, 0, 255, 1, 0);
>> >
>> >     sd->ctrl_handler = &device->hdl;
>> >     if (device->hdl.error) {
>> >
>> > -           int err = device->hdl.error;
>> > -
>> >
>> >             v4l2_ctrl_handler_free(&device->hdl);
>> >
>> > -           kfree(device);
>> > -           return err;
>> > +           return device->hdl.error;
>>
>> At this point device->hdl as been freed (or rather uninitialized, as the
>> structure is not dynamically allocated by the control framework), so device-
>> >hdl.error is undefined. That's why you need the local err variable.
>
> And this comment holds true for the other patches in this series.
>
Ok I'll fix it respin a v2.

>> >
>> >     }
>> >     v4l2_ctrl_handler_setup(&device->hdl);
>> >
>> >  found_error:
>> > -   if (error < 0)
>> > -           kfree(device);
>>
>> You can remove the found_error label and return errors directly instead of
>> using goto's.
>>
Ok

>> >     return error;
>>
>> And this can then be turned into return 0.
Ok.

Regards,
--Prabhakar

>>
>> >  }
>> >
>> > @@ -1120,7 +1115,6 @@ static int tvp7002_remove(struct i2c_client *c)
>> >
>> >     v4l2_device_unregister_subdev(sd);
>> >     v4l2_ctrl_handler_free(&device->hdl);
>> >
>> > -   kfree(device);
>> >
>> >     return 0;
>> >
>> >  }
>
> --
> Regards,
>
> Laurent Pinchart
>
> --
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