[PATCH] dwc3: make PM functions as __maybe_unused

[Arnd Bergmann]

A change to the suspend/resume handling in dwc3-pci introduced a
harmless warning:

drivers/usb/dwc3/dwc3-pci.c:169:12: error: âdwc3_pci_dsmâ defined but not used [-Werror=unused-function]

Replacing the #ifdef around the PM functions with __maybe_unused
annotations is the easiest way to make sure this doesn't happen
again. A similar problem happened two months earlier and we
ended up updating the #ifdef, but as it has come back now,
I'd suggest going back to my earlier approach.

Fixes: 9cecca75b5a0 ("usb: dwc3: pci: call _DSM for suspend/resume")
Link: https://patchwork.kernel.org/patch/9318887/
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 drivers/usb/dwc3/dwc3-pci.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index 8c39ec6522fd..771b620b4878 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -293,8 +293,7 @@ static const struct pci_device_id dwc3_pci_id_table[] = {
 };
 MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);
 
-#ifdef CONFIG_PM
-static int dwc3_pci_runtime_suspend(struct device *dev)
+static int __maybe_unused dwc3_pci_runtime_suspend(struct device *dev)
 {
 	struct dwc3_pci		*dwc = dev_get_drvdata(dev);
 
@@ -304,7 +303,7 @@ static int dwc3_pci_runtime_suspend(struct device *dev)
 	return -EBUSY;
 }
 
-static int dwc3_pci_runtime_resume(struct device *dev)
+static int __maybe_unused dwc3_pci_runtime_resume(struct device *dev)
 {
 	struct dwc3_pci		*dwc = dev_get_drvdata(dev);
 	struct platform_device	*dwc3 = dwc->dwc3;
@@ -316,23 +315,20 @@ static int dwc3_pci_runtime_resume(struct device *dev)
 
 	return pm_runtime_get(&dwc3->dev);
 }
-#endif /* CONFIG_PM */
 
-#ifdef CONFIG_PM_SLEEP
-static int dwc3_pci_suspend(struct device *dev)
+static int __maybe_unused dwc3_pci_suspend(struct device *dev)
 {
 	struct dwc3_pci		*dwc = dev_get_drvdata(dev);
 
 	return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D3);
 }
 
-static int dwc3_pci_resume(struct device *dev)
+static int __maybe_unused dwc3_pci_resume(struct device *dev)
 {
 	struct dwc3_pci		*dwc = dev_get_drvdata(dev);
 
 	return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
 }
-#endif /* CONFIG_PM_SLEEP */
 
 static struct dev_pm_ops dwc3_pci_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_suspend, dwc3_pci_resume)
-- 
2.9.0