Merge tag 'pci-v4.21-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...

[sfrench/cifs-2.6.git] / drivers / pci / pci-driver.c

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index ea55444e6eaddfcb572a9b2dd50f9dceb0b08a3c..79b1610a8bebe7c156125ccf877e8e3b50e58d2d 100644 (file)
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -1251,30 +1251,29 @@ static int pci_pm_runtime_suspend(struct device *dev)
                return 0;
        }
 
-       if (!pm || !pm->runtime_suspend)
-               return -ENOSYS;
-
        pci_dev->state_saved = false;
-       error = pm->runtime_suspend(dev);
-       if (error) {
+       if (pm && pm->runtime_suspend) {
+               error = pm->runtime_suspend(dev);
                /*
                 * -EBUSY and -EAGAIN is used to request the runtime PM core
                 * to schedule a new suspend, so log the event only with debug
                 * log level.
                 */
-               if (error == -EBUSY || error == -EAGAIN)
+               if (error == -EBUSY || error == -EAGAIN) {
                        dev_dbg(dev, "can't suspend now (%pf returned %d)\n",
                                pm->runtime_suspend, error);
-               else
+                       return error;
+               } else if (error) {
                        dev_err(dev, "can't suspend (%pf returned %d)\n",
                                pm->runtime_suspend, error);
-
-               return error;
+                       return error;
+               }
        }
 
        pci_fixup_device(pci_fixup_suspend, pci_dev);
 
-       if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
+       if (pm && pm->runtime_suspend
+           && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
            && pci_dev->current_state != PCI_UNKNOWN) {
                WARN_ONCE(pci_dev->current_state != prev,
                        "PCI PM: State of device not saved by %pF\n",
@@ -1292,7 +1291,7 @@ static int pci_pm_runtime_suspend(struct device *dev)
 
 static int pci_pm_runtime_resume(struct device *dev)
 {
-       int rc;
+       int rc = 0;
        struct pci_dev *pci_dev = to_pci_dev(dev);
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
@@ -1306,14 +1305,12 @@ static int pci_pm_runtime_resume(struct device *dev)
        if (!pci_dev->driver)
                return 0;
 
-       if (!pm || !pm->runtime_resume)
-               return -ENOSYS;
-
        pci_fixup_device(pci_fixup_resume_early, pci_dev);
        pci_enable_wake(pci_dev, PCI_D0, false);
        pci_fixup_device(pci_fixup_resume, pci_dev);
 
-       rc = pm->runtime_resume(dev);
+       if (pm && pm->runtime_resume)
+               rc = pm->runtime_resume(dev);
 
        pci_dev->runtime_d3cold = false;