Re: [PATCH] arm: ecard: Fix compilation warning.

[Belisko Marek]

On Mon, Dec 6, 2010 at 3:05 PM, Russell King - ARM Linux
<linux@xxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx>
>> ---
>> Âarch/arm/kernel/ecard.c | Â Â6 ++++--
>> Â1 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)
>> Â Â Â *ecp = ec;
>> Â Â Â slot_to_expcard[slot] = ec;
>>
>> - Â Â device_register(&ec->dev);
>> -
>> + Â Â rc = device_register(&ec->dev);
>> + Â Â if (rc)
>> + Â Â Â Â Â Â goto nodev;
>> +
>> Â Â Â return 0;
>
> No. ÂIt is important that cards which are actually there remain present
> even if device_register fails. ÂIn 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

-- 
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
Tel: +421 915 052 184
skype: marekwhite
icq: 290551086
web: http://open-nandra.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/