On Tuesday, September 09, 2014 9:14 AM, Rusty Russell wrote:
> Jingoo Han <jg1....@samsung.com> writes:
> > Use SIMPLE_DEV_PM_OPS macro in order to make the code simpler.
> >
> > Signed-off-by: Jingoo Han <jg1....@samsung.com>
>
> This patch is obviously wrong. It won't compile without
> CONFIG_PM_SLEEP.
No, there is no compile issue.
When, CONFIG_PM_SLEEP=n, there is no build error.
'SIMPLE_DEV_PM_OPS' macro is defined as follows.
#define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
const struct dev_pm_ops name = { \
SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
}
In addition, 'SET_SYSTEM_SLEEP_PM_OPS' is defined as follows.
#ifdef CONFIG_PM_SLEEP
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
.suspend = suspend_fn, \
.resume = resume_fn, \
.freeze = suspend_fn, \
.thaw = resume_fn, \
.poweroff = suspend_fn, \
.restore = resume_fn,
#else
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
#endif
So, when CONFIG_PM_SLEEP is NOT enabled, SIMPLE_DEV_PM_OPS can be
changed as below. The members of virtio_pci_pm_ops can be NULL.
Thus, there is no build error, when CONFIG_PM_SLEEP=n.
However, if you want, I will just change SET_SYSTEM_SLEEP_PM_OPS
into SIMPLE_DEV_PM_OPS macro, without any change about
'#ifdef CONFIG_PM_SLEEP' guards.
const struct dev_pm_ops virtio_pci_pm_ops = {
};
static struct pci_driver virtio_pci_driver = {
.name = "virtio-pci",
.id_table = virtio_pci_id_table,
.probe = virtio_pci_probe,
.remove = virtio_pci_remove,
.driver.pm = &virtio_pci_pm_ops,
};
Best regards,
Jingoo Han
>
> Cheers,
> Rusty.
>
> > ---
> > drivers/virtio/virtio_pci.c | 9 +++------
> > 1 file changed, 3 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> > index 3d1463c6b120..c5fbdb4023d1 100644
> > --- a/drivers/virtio/virtio_pci.c
> > +++ b/drivers/virtio/virtio_pci.c
> > @@ -810,20 +810,17 @@ static int virtio_pci_restore(struct device *dev)
> >
> > return ret;
> > }
> > -
> > -static const struct dev_pm_ops virtio_pci_pm_ops = {
> > - SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
> > -};
> > #endif
> >
> > +static SIMPLE_DEV_PM_OPS(virtio_pci_pm_ops, virtio_pci_freeze,
> > + virtio_pci_restore);
> > +
> > static struct pci_driver virtio_pci_driver = {
> > .name = "virtio-pci",
> > .id_table = virtio_pci_id_table,
> > .probe = virtio_pci_probe,
> > .remove = virtio_pci_remove,
> > -#ifdef CONFIG_PM_SLEEP
> > .driver.pm = &virtio_pci_pm_ops,
> > -#endif
> > };
> >
> > module_pci_driver(virtio_pci_driver);
> > --
> > 2.0.0
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