diff mbox series

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

Message ID 20191014230016.240912-6-helgaas@kernel.org (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show
Series PCI: PM: Move to D0 before calling pci_legacy_resume_early() | expand

Commit Message

Bjorn Helgaas Oct. 14, 2019, 11 p.m. UTC 
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>
---
 drivers/pci/pci-driver.c | 76 +++++++++++++++++++---------------------
 1 file changed, 36 insertions(+), 40 deletions(-)

Comments

Rafael J. Wysocki Oct. 15, 2019, 5:22 p.m. UTC | #1 
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 = {
>
Dan Carpenter Oct. 16, 2019, 1:50 p.m. UTC | #2 
On Mon, Oct 14, 2019 at 06:00:14PM -0500, 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;

I like this patch a lot, especially the direct returns.  But it
occurs to me that in the future this conditional would look better as

	const struct dev_pm_ops *pm = driver_to_pm(dev->driver);

or something.

regards,
dan carpenter
diff mbox series

Patch

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 = {