linux-kernel - Re: [PATCH 4/4] USB: HID: SRW-S1 Add support controlling all LEDs simultaneously

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Date:	Mon, 28 Jan 2013 10:24:19 -0500
From:	simon@...gewell.org
To:	"Jiri Kosina" <jkosina@...e.cz>
Cc:	"Simon Wood" <simon@...gewell.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, rosegardener@...eode.co.uk
Subject: Re: [PATCH 4/4] USB: HID: SRW-S1 Add support controlling all LEDs
 simultaneously

> On Thu, 24 Jan 2013, Simon Wood wrote:
>
>> From: simon <simon@...on-virtual-machine.(none)>
>>
>> This patch to the SRW-S1 driver adds the ability to control all
>> LEDs simultaneously as testing showed that it was slow (noticably!!)
>> when seting or clearing all the LEDs in turn.
>>
>> It adds a 'RPMALL' LED, whose behavoir is asserted to all the LEDs in
>> the bar graph, individual LEDs can subsequently be turned on/off
>> individually.
>>
>> Signed-off-by: Simon Wood <simon@...gewell.org>
>> tested-by: John Murphy <rosegardener@...eode.co.uk>
> [ ... snip ... ]
>
>> @@ -219,13 +255,34 @@ static int srws1_probe(struct hid_device *hdev,
>>
>>  	/* register led subsystem */
>>  	drv_data->led_state = 0;
>> -	for (i = 0; i < SRWS1_NUMBER_LEDS; i++)
>> +	for (i = 0; i < SRWS1_NUMBER_LEDS + 1; i++)
>>  		drv_data->led[i] = NULL;
>>
>>  	srws1_set_leds(hdev, 0);
>>
>> -	name_sz = strlen(hdev->uniq) + 15;
>> +	name_sz = strlen(hdev->uniq) + 16;
>> +
>> +	/* 'ALL', for setting all LEDs simultaneously */
>> +	led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
>
> Is this memory ever freed?

Yes. The pointer to it is stored at the end of the drv_data leds[] array
(line 280), and will be free'd on probe fail (line 314) or when device is
removed (line 341).

Simon

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