[PATCH] PCI: Error handling on PCI device resume

We currently don't handle errors properly when resuming a PCI device:
* In pci_default_resume() we capture the error code returned by
  pci_enable_device() but don't pass it up to the caller.
  Introduced by commit 95a629657dbe28e44a312c47815b3dc3f1ce0970
* In pci_resume_device(), the errors possibly returned by the driver's
  .resume method or by the generic pci_default_resume() function are
  ignored.

This patch fixes both issues.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 1456759936c5..10e1a905c144 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -285,9 +285,9 @@ static int pci_device_suspend(struct device * dev, pm_message_t state)
  * Default resume method for devices that have no driver provided resume,
  * or not even a driver at all.
  */
-static void pci_default_resume(struct pci_dev *pci_dev)
+static int pci_default_resume(struct pci_dev *pci_dev)
 {
-        int retval;
+        int retval = 0;
 
         /* restore the PCI config space */
         pci_restore_state(pci_dev);
@@ -297,18 +297,21 @@ static void pci_default_resume(struct pci_dev *pci_dev)
         /* if the device was busmaster before the suspend, make it busmaster again */
         if (pci_dev->is_busmaster)
                 pci_set_master(pci_dev);
+
+        return retval;
 }
 
 static int pci_device_resume(struct device * dev)
 {
+        int error;
         struct pci_dev * pci_dev = to_pci_dev(dev);
         struct pci_driver * drv = pci_dev->driver;
 
         if (drv && drv->resume)
-                drv->resume(pci_dev);
+                error = drv->resume(pci_dev);
         else
-                pci_default_resume(pci_dev);
-        return 0;
+                error = pci_default_resume(pci_dev);
+        return error;
 }
 
 static void pci_device_shutdown(struct device *dev)