linux-kernel - Re: [PATCH 1/2] HID: hid-lg4ff: Use Private Data

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Date:	Mon, 02 Apr 2012 18:32:06 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Simon Wood <simon@...gewell.org>
CC:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jiri Kosina <jkosina@...e.cz>,
	Michael Bauer <michael@...auer.org>,
	Michal Maly <madcatxster@...il.com>
Subject: Re: [PATCH 1/2] HID: hid-lg4ff: Use Private Data

On 04/02/2012 04:54 PM, Simon Wood wrote:
> Use private data in hid-lg4ff to store device properties.
> 
> This code was writen by Michal, he asked me to check it and forward
> it on to the list.

So this patch is missing proper From: header.

> Signed-off-by: Michal Maly <madcatxster@...il.com>
> Signed-off-by: Simon Wood <simon@...gewell.org>
> ---
>  drivers/hid/hid-lg4ff.c |   96 +++++++++++++++++++++-------------------------
>  1 files changed, 44 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
> index 1145292..c3146e0 100644
> --- a/drivers/hid/hid-lg4ff.c
> +++ b/drivers/hid/hid-lg4ff.c
> @@ -285,18 +280,20 @@ static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_n
>  /* Read current range and display it in terminal */
>  static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
>  {
> -	struct lg4ff_device_entry *uninitialized_var(entry);
> -	struct list_head *h;
>  	struct hid_device *hid = to_hid_device(dev);
> +	struct lg4ff_device_entry *uninitialized_var(entry);
> +	struct lg_drv_data *uninitialized_var(drv_data);

You don't need uninitialized_var bloat anymroe, right?

Here and at the other places too...

>  	size_t count;
>  
> -	list_for_each(h, &device_list.list) {
> -		entry = list_entry(h, struct lg4ff_device_entry, list);
> -		if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0)
> -			break;
> +	drv_data = hid_get_drvdata(hid);
> +	if (!drv_data) {
> +		hid_err(hid, "Private driver data not found!\n");
> +		return 0;
>  	}
> -	if (h == &device_list.list) {
> -		dbg_hid("Device not found!");
> +
> +	entry = drv_data->device_props;
> +	if (!entry) {
> +		hid_err(hid, "Device properties not found!\n");
>  		return 0;
>  	}
>  

-- 
js
suse labs

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