linux-kernel - Re: [PATCH v4 2/3] mfd: viperboard: switch to devm

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Message-ID: <20140925155310.GK32124@localhost>
Date:	Thu, 25 Sep 2014 17:53:10 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	sameo@...ux.intel.com, lee.jones@...aro.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	johan@...nel.org
Subject: Re: [PATCH v4 2/3] mfd: viperboard: switch to devm_ allocation

On Thu, Sep 25, 2014 at 06:41:36PM +0300, Octavian Purdila wrote:
> Switch to using devm_ allocation to simplify the error path. Also
> remove a redundant OOM error message.
> 
> Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>

Reviewed-by: Johan Hovold <johan@...nel.org>

> ---
>  drivers/mfd/viperboard.c | 23 +++++++----------------
>  1 file changed, 7 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/mfd/viperboard.c b/drivers/mfd/viperboard.c
> index 5f62f4e..0d46d05 100644
> --- a/drivers/mfd/viperboard.c
> +++ b/drivers/mfd/viperboard.c
> @@ -58,17 +58,14 @@ static int vprbrd_probe(struct usb_interface *interface,
>  	int pipe, ret;
>  
>  	/* allocate memory for our device state and initialize it */
> -	vb = kzalloc(sizeof(*vb), GFP_KERNEL);
> -	if (vb == NULL) {
> -		dev_err(&interface->dev, "Out of memory\n");
> +	vb = devm_kzalloc(&interface->dev, sizeof(*vb), GFP_KERNEL);
> +	if (vb == NULL)
>  		return -ENOMEM;
> -	}
>  
> -	vb->buf = kzalloc(sizeof(struct vprbrd_i2c_write_msg), GFP_KERNEL);
> -	if (vb->buf == NULL) {
> -		ret = -ENOMEM;
> -		goto error;
> -	}
> +	vb->buf = devm_kzalloc(&interface->dev,
> +			       sizeof(struct vprbrd_i2c_write_msg), GFP_KERNEL);
> +	if (vb->buf == NULL)
> +		return -ENOMEM;
>  
>  	mutex_init(&vb->lock);
>  
> @@ -109,11 +106,7 @@ static int vprbrd_probe(struct usb_interface *interface,
>  	return 0;
>  
>  error:
> -	if (vb) {
> -		usb_put_dev(vb->usb_dev);
> -		kfree(vb->buf);
> -		kfree(vb);
> -	}
> +	usb_put_dev(vb->usb_dev);
>  
>  	return ret;
>  }
> @@ -125,8 +118,6 @@ static void vprbrd_disconnect(struct usb_interface *interface)
>  	mfd_remove_devices(&interface->dev);
>  	usb_set_intfdata(interface, NULL);
>  	usb_put_dev(vb->usb_dev);
> -	kfree(vb->buf);
> -	kfree(vb);
>  
>  	dev_dbg(&interface->dev, "disconnected\n");
>  }
--
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