Re: [PATCH 5/7] PCI/PM: Make power management op coding style consistent

Rafael J. Wysocki
2019-10-15T17:22:36Z

On Tuesday, October 15, 2019 1:00:14 AM CEST Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> Some of the power management ops use this style:
>
> struct device_driver *drv = dev->driver;
> if (drv && drv->pm && drv->pm->prepare(dev))
> drv->pm->prepare(dev);
>
> while others use this:
>
> const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> if (pm && pm->runtime_resume)
> pm->runtime_resume(dev);
>
> Convert the first style to the second so they're all consistent. Remove
> local "error" variables when unnecessary. No functional change intended.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

No issues found, so

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
> drivers/pci/pci-driver.c | 76 +++++++++++++++++++---------------------
> 1 file changed, 36 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index 55acb658273f..abbf5c39cb9c 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -679,11 +679,11 @@ static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
>
> static int pci_pm_prepare(struct device *dev)
> {
> - struct device_driver *drv = dev->driver;
> struct pci_dev *pci_dev = to_pci_dev(dev);
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
>
> - if (drv && drv->pm && drv->pm->prepare) {
> - int error = drv->pm->prepare(dev);
> + if (pm && pm->prepare) {
> + int error = pm->prepare(dev);
> if (error < 0)
> return error;
>
> @@ -917,8 +917,7 @@ static int pci_pm_suspend_noirq(struct device *dev)
> static int pci_pm_resume_noirq(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> - struct device_driver *drv = dev->driver;
> - int error = 0;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
>
> if (dev_pm_may_skip_resume(dev))
> return 0;
> @@ -946,17 +945,16 @@ static int pci_pm_resume_noirq(struct device *dev)
> if (pci_has_legacy_pm_support(pci_dev))
> return pci_legacy_resume_early(dev);
>
> - if (drv && drv->pm && drv->pm->resume_noirq)
> - error = drv->pm->resume_noirq(dev);
> + if (pm && pm->resume_noirq)
> + return pm->resume_noirq(dev);
>
> - return error;
> + return 0;
> }
>
> static int pci_pm_resume(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> - int error = 0;
>
> /*
> * This is necessary for the suspend error path in which resume is
> @@ -972,12 +970,12 @@ static int pci_pm_resume(struct device *dev)
>
> if (pm) {
> if (pm->resume)
> - error = pm->resume(dev);
> + return pm->resume(dev);
> } else {
> pci_pm_reenable_device(pci_dev);
> }
>
> - return error;
> + return 0;
> }
>
> #else /* !CONFIG_SUSPEND */
> @@ -1038,16 +1036,16 @@ static int pci_pm_freeze(struct device *dev)
> static int pci_pm_freeze_noirq(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> - struct device_driver *drv = dev->driver;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
>
> if (pci_has_legacy_pm_support(pci_dev))
> return pci_legacy_suspend_late(dev, PMSG_FREEZE);
>
> - if (drv && drv->pm && drv->pm->freeze_noirq) {
> + if (pm && pm->freeze_noirq) {
> int error;
>
> - error = drv->pm->freeze_noirq(dev);
> - suspend_report_result(drv->pm->freeze_noirq, error);
> + error = pm->freeze_noirq(dev);
> + suspend_report_result(pm->freeze_noirq, error);
> if (error)
> return error;
> }
> @@ -1066,8 +1064,8 @@ static int pci_pm_freeze_noirq(struct device *dev)
> static int pci_pm_thaw_noirq(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> - struct device_driver *drv = dev->driver;
> - int error = 0;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> + int error;
>
> if (pcibios_pm_ops.thaw_noirq) {
> error = pcibios_pm_ops.thaw_noirq(dev);
> @@ -1091,10 +1089,10 @@ static int pci_pm_thaw_noirq(struct device *dev)
> if (pci_has_legacy_pm_support(pci_dev))
> return pci_legacy_resume_early(dev);
>
> - if (drv && drv->pm && drv->pm->thaw_noirq)
> - error = drv->pm->thaw_noirq(dev);
> + if (pm && pm->thaw_noirq)
> + return pm->thaw_noirq(dev);
>
> - return error;
> + return 0;
> }
>
> static int pci_pm_thaw(struct device *dev)
> @@ -1165,24 +1163,24 @@ static int pci_pm_poweroff_late(struct device *dev)
> static int pci_pm_poweroff_noirq(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> - struct device_driver *drv = dev->driver;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
>
> if (dev_pm_smart_suspend_and_suspended(dev))
> return 0;
>
> - if (pci_has_legacy_pm_support(to_pci_dev(dev)))
> + if (pci_has_legacy_pm_support(pci_dev))
> return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
>
> - if (!drv || !drv->pm) {
> + if (!pm) {
> pci_fixup_device(pci_fixup_suspend_late, pci_dev);
> return 0;
> }
>
> - if (drv->pm->poweroff_noirq) {
> + if (pm->poweroff_noirq) {
> int error;
>
> - error = drv->pm->poweroff_noirq(dev);
> - suspend_report_result(drv->pm->poweroff_noirq, error);
> + error = pm->poweroff_noirq(dev);
> + suspend_report_result(pm->poweroff_noirq, error);
> if (error)
> return error;
> }
> @@ -1208,8 +1206,8 @@ static int pci_pm_poweroff_noirq(struct device *dev)
> static int pci_pm_restore_noirq(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> - struct device_driver *drv = dev->driver;
> - int error = 0;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> + int error;
>
> if (pcibios_pm_ops.restore_noirq) {
> error = pcibios_pm_ops.restore_noirq(dev);
> @@ -1223,17 +1221,16 @@ static int pci_pm_restore_noirq(struct device *dev)
> if (pci_has_legacy_pm_support(pci_dev))
> return pci_legacy_resume_early(dev);
>
> - if (drv && drv->pm && drv->pm->restore_noirq)
> - error = drv->pm->restore_noirq(dev);
> + if (pm && pm->restore_noirq)
> + return pm->restore_noirq(dev);
>
> - return error;
> + return 0;
> }
>
> static int pci_pm_restore(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> - int error = 0;
>
> /*
> * This is necessary for the hibernation error path in which restore is
> @@ -1249,12 +1246,12 @@ static int pci_pm_restore(struct device *dev)
>
> if (pm) {
> if (pm->restore)
> - error = pm->restore(dev);
> + return pm->restore(dev);
> } else {
> pci_pm_reenable_device(pci_dev);
> }
>
> - return error;
> + return 0;
> }
>
> #else /* !CONFIG_HIBERNATE_CALLBACKS */
> @@ -1330,9 +1327,9 @@ static int pci_pm_runtime_suspend(struct device *dev)
>
> static int pci_pm_runtime_resume(struct device *dev)
> {
> - int rc = 0;
> struct pci_dev *pci_dev = to_pci_dev(dev);
> const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> + int error = 0;
>
> /*
> * Restoring config space is necessary even if the device is not bound
> @@ -1348,18 +1345,17 @@ static int pci_pm_runtime_resume(struct device *dev)
> pci_pm_default_resume(pci_dev);
>
> if (pm && pm->runtime_resume)
> - rc = pm->runtime_resume(dev);
> + error = pm->runtime_resume(dev);
>
> pci_dev->runtime_d3cold = false;
>
> - return rc;
> + return error;
> }
>
> static int pci_pm_runtime_idle(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> - int ret = 0;
>
> /*
> * If pci_dev->driver is not set (unbound), the device should
> @@ -1372,9 +1368,9 @@ static int pci_pm_runtime_idle(struct device *dev)
> return -ENOSYS;
>
> if (pm->runtime_idle)
> - ret = pm->runtime_idle(dev);
> + return pm->runtime_idle(dev);
>
> - return ret;
> + return 0;
> }
>
> static const struct dev_pm_ops pci_dev_pm_ops = {
>