linux-kernel - Re: [PATCH 3/5]pci:bus.c Fix variable 'retval' set but not used

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Date:	Tue, 15 Jun 2010 23:56:48 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Julian Calaby <julian.calaby@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 3/5]pci:bus.c Fix variable 'retval' set but not used

On 06/15/2010 10:42 PM, Julian Calaby wrote:
> On Wed, Jun 16, 2010 at 15:33, Justin P. Mattock
> <justinmattock@...il.com>  wrote:
>> The patch below fixes the warning message I am seeing with gcc 4.6.0
>>   CC      drivers/pci/bus.o
>> drivers/pci/bus.c: In function 'pci_enable_bridges':
>> drivers/pci/bus.c:237:6: warning: variable 'retval' set but not used
>>
>>   Signed-off-by: Justin P. Mattock<justinmattock@...il.com>
>>
>> ---
>>   drivers/pci/bus.c |    2 --
>>   1 files changed, 0 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
>> index 628ea20..84bdb48 100644
>> --- a/drivers/pci/bus.c
>> +++ b/drivers/pci/bus.c
>> @@ -234,12 +234,10 @@ void pci_bus_add_devices(const struct pci_bus *bus)
>>   void pci_enable_bridges(struct pci_bus *bus)
>>   {
>>         struct pci_dev *dev;
>> -       int retval;
>>
>>         list_for_each_entry(dev,&bus->devices, bus_list) {
>>                 if (dev->subordinate) {
>>                         if (!pci_is_enabled(dev)) {
>> -                               retval = pci_enable_device(dev);
>>                                 pci_set_master(dev);
>>                         }
>>                         pci_enable_bridges(dev->subordinate);
>
> Er, this appears to be bogus: I'm only guessing, but I'd expect that
> the pci_enable_device() call is actually doing something useful, and
> removing it is going to break *something* - Have you booted a kernel
> with this code enabled and these patches applied?
>
> As for this warning, I think that there is a better solution.
>
> Thanks,
>

alright!!

Justin P. Mattock
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