1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f0d68066c726..3ff0c3c18276 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4170,6 +4170,14 @@ int __pci_reset_function_locked(struct pci_dev *dev)
 
         might_sleep();
 
+        /*
+         * A reset method returns -ENOTTY if it doesn't support this device
+         * and we should try the next method.
+         *
+         * If it returns 0 (success), we're finished.  If it returns any
+         * other error, we're also finished: this indicates that further
+         * reset mechanisms might be broken on the device.
+         */
         rc = pci_dev_specific_reset(dev, 0);
         if (rc != -ENOTTY)
                 return rc;