On Tue, Jan 22, 2013 at 04:32:06PM +0800, Aaron Lu wrote:
> Hi Dan,
>
> Thanks for the remind.
>
> On 01/22/2013 02:25 PM, Dan Carpenter wrote:
> > Hi Aaron,
> >
> > FYI, there are new smatch warnings show up in
> >
> > tree: git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev.git upstream
> > head: 7e15e9be37eb834aaaca69030064ac97eaf5df2f
> > commit: f064a20dded807448669426c9bfb7d03aba5659c [7/11] libata: move acpi notification code to zpodd
> >
> > New smatch warnings:
> > drivers/ata/libata-zpodd.c:83 zpodd_wake_dev() warn: variable dereferenced before check 'ata_dev' (see line 80)
>
> The ata_dev variable shouldn't ever be NULL here.
>
> >
> > git remote add libata git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev.git
> > git remote update libata
> > git checkout f064a20dded807448669426c9bfb7d03aba5659c
> > vim +/ata_dev +83 drivers/ata/libata-zpodd.c
> >
> > afe75951 Aaron Lu 2013-01-15 74 return acpi_device_can_poweroff(acpi_dev);
> > afe75951 Aaron Lu 2013-01-15 75 }
> > afe75951 Aaron Lu 2013-01-15 76
> > f064a20d Aaron Lu 2013-01-15 77 static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context)
> > f064a20d Aaron Lu 2013-01-15 78 {
> > f064a20d Aaron Lu 2013-01-15 79 struct ata_device *ata_dev = context;
> > f064a20d Aaron Lu 2013-01-15 @80 struct zpodd *zpodd = ata_dev->zpodd;
> > f064a20d Aaron Lu 2013-01-15 81 struct device *dev = &ata_dev->sdev->sdev_gendev;
> > f064a20d Aaron Lu 2013-01-15 82
> > f064a20d Aaron Lu 2013-01-15 @83 if (event == ACPI_NOTIFY_DEVICE_WAKE && ata_dev &&
>
> If I remove the check for ata_dev here, will the smatch warning go away?
> Or should I add a check above? I suppose we need to do something to the
> warning, so that it won't pop up in the future, so please feel free to
> suggest, thanks!
Removing the check would silence the warning.
regards,
dan carpenter
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