linux-kernel - Re: [PATCH] hid: Initialize battery_no to -1 & correct its format string

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Date:	Tue, 6 Jan 2015 20:02:50 +0530
From:	Aniroop Mathur <aniroop.mathur@...il.com>
To:	Jason Gerecke <killertofu@...il.com>, Ping Cheng <pingc@...om.com>,
	Jiri Kosina <jkosina@...e.cz>
Cc:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	linux-kernel@...r.kernel.org, a.mathur@...sung.com
Subject: Re: [PATCH] hid: Initialize battery_no to -1 & correct its format string

Dear Mr. Jason and Mr. Ping,

Please update about below patch.
Except avoiding subtraction, there is also a need to avoid negative
battery name which may come due to %ld, so need to change to %lu.

Thanks,
Aniroop

On Mon, Dec 29, 2014 at 5:33 PM, Jiri Kosina <jkosina@...e.cz> wrote:
> On Sun, 28 Dec 2014, Aniroop Mathur wrote:
>
>> From: Aniroop Mathur <a.mathur@...sung.com>
>>
>> This patch initializes battery_no to -1 to avoid extra subtraction
>> operation performed everytime wacom battery is initialized
>
> This is so femto-optimization, that I don't really care deeply. Adding
> Jason and Ping to CC. If they want this, I'll apply the patch.
>
>> and correct format string of unsigned long from %ld to %lu.
>>
>> Signed-off-by: Aniroop Mathur <a.mathur@...sung.com>
>> ---
>>  drivers/hid/wacom_sys.c | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
>> index 129fd33..4b5ff84 100644
>> --- a/drivers/hid/wacom_sys.c
>> +++ b/drivers/hid/wacom_sys.c
>> @@ -919,17 +919,17 @@ static int wacom_ac_get_property(struct power_supply *psy,
>>
>>  static int wacom_initialize_battery(struct wacom *wacom)
>>  {
>> -     static atomic_t battery_no = ATOMIC_INIT(0);
>> +     static atomic_t battery_no = ATOMIC_INIT(-1);
>>       int error;
>>       unsigned long n;
>>
>>       if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) {
>> -             n = atomic_inc_return(&battery_no) - 1;
>> +             n = atomic_inc_return(&battery_no);
>>
>>               wacom->battery.properties = wacom_battery_props;
>>               wacom->battery.num_properties = ARRAY_SIZE(wacom_battery_props);
>>               wacom->battery.get_property = wacom_battery_get_property;
>> -             sprintf(wacom->wacom_wac.bat_name, "wacom_battery_%ld", n);
>> +             sprintf(wacom->wacom_wac.bat_name, "wacom_battery_%lu", n);
>>               wacom->battery.name = wacom->wacom_wac.bat_name;
>>               wacom->battery.type = POWER_SUPPLY_TYPE_BATTERY;
>>               wacom->battery.use_for_apm = 0;
>> @@ -937,7 +937,7 @@ static int wacom_initialize_battery(struct wacom *wacom)
>>               wacom->ac.properties = wacom_ac_props;
>>               wacom->ac.num_properties = ARRAY_SIZE(wacom_ac_props);
>>               wacom->ac.get_property = wacom_ac_get_property;
>> -             sprintf(wacom->wacom_wac.ac_name, "wacom_ac_%ld", n);
>> +             sprintf(wacom->wacom_wac.ac_name, "wacom_ac_%lu", n);
>>               wacom->ac.name = wacom->wacom_wac.ac_name;
>>               wacom->ac.type = POWER_SUPPLY_TYPE_MAINS;
>>               wacom->ac.use_for_apm = 0;
>> --
>> 1.9.1
>>
>
> --
> Jiri Kosina
> SUSE Labs
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