X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2FDocumentation%2Fpower%2Fdevices.txt;h=8ba6625fdd63da42eae53cbbb1ca6539c199aa2e;hb=e09b41010ba33a20a87472ee821fa407a5b8da36;hp=d172bce0fd49845e4b9dd5a76b068e28e22055b5;hpb=f93b97fd65072de626c074dbe099a1fff05ce060;p=kvmfornfv.git

diff --git a/kernel/Documentation/power/devices.txt b/kernel/Documentation/power/devices.txt
index d172bce0f..8ba6625fd 100644
--- a/kernel/Documentation/power/devices.txt
+++ b/kernel/Documentation/power/devices.txt
@@ -341,6 +341,13 @@ the phases are:
 	and is entirely responsible for bringing the device back to the
 	functional state as appropriate.
 
+	Note that this direct-complete procedure applies even if the device is
+	disabled for runtime PM; only the runtime-PM status matters.  It follows
+	that if a device has system-sleep callbacks but does not support runtime
+	PM, then its prepare callback must never return a positive value.  This
+	is because all devices are initially set to runtime-suspended with
+	runtime PM disabled.
+
     2.	The suspend methods should quiesce the device to stop it from performing
 	I/O.  They also may save the device registers and put it into the
 	appropriate low-power state, depending on the bus type the device is on,