linux-kernel - Re: [PATCH] arm: ecard: Fix compilation warning.

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Date:	Mon, 6 Dec 2010 20:11:16 +0100
From:	Belisko Marek <marek.belisko@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: ecard: Fix compilation warning.

On Mon, Dec 6, 2010 at 3:05 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Mon, Dec 06, 2010 at 03:04:03PM +0100, Marek Belisko wrote:
>> Fix following compilation warning:
>> arch/arm/kernel/ecard.c:1066: warning: ignoring return value of
>> 'device_register', declared with attribute warn_unused_result
>>
>> Signed-off-by: Marek Belisko <marek.belisko@...n-nandra.com>
>> ---
>>  arch/arm/kernel/ecard.c |    6 ++++--
>>  1 files changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm/kernel/ecard.c b/arch/arm/kernel/ecard.c
>> index eed2f79..da882b1 100644
>> --- a/arch/arm/kernel/ecard.c
>> +++ b/arch/arm/kernel/ecard.c
>> @@ -1063,8 +1063,10 @@ ecard_probe(int slot, card_type_t type)
>>       *ecp = ec;
>>       slot_to_expcard[slot] = ec;
>>
>> -     device_register(&ec->dev);
>> -
>> +     rc = device_register(&ec->dev);
>> +     if (rc)
>> +             goto nodev;
>> +
>>       return 0;
>
> No.  It is important that cards which are actually there remain present
> even if device_register fails.  In other words, we _really_ don't care
> what device_register() returns.
OK understand but anyway to stop compiler bark following could be OK and
maybe other people saw error and try to send same patch so keep them informed.

diff --git a/arch/arm/kernel/ecard.c b/arch/arm/kernel/ecard.c
index eed2f79..d3dcb1a 100644
--- a/arch/arm/kernel/ecard.c
+++ b/arch/arm/kernel/ecard.c
@@ -1062,8 +1062,12 @@ ecard_probe(int slot, card_type_t type)

        *ecp = ec;
        slot_to_expcard[slot] = ec;
-
-       device_register(&ec->dev);
+       /*
+        * Return value not checked. It is important that cards
+        * which are actually there remain present even if
+        * device_register fails.
+        */
+       rc = device_register(&ec->dev);

        return 0;

>

thanks,

marek

-- 
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Marek Belisko - OPEN-NANDRA
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