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

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Date:	Wed, 16 Jun 2010 15:42:02 +1000
From:	Julian Calaby <julian.calaby@...il.com>
To:	"Justin P. Mattock" <justinmattock@...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 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,

-- 

Julian Calaby

Email: julian.calaby@...il.com
.Plan: http://sites.google.com/site/juliancalaby/
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