rt2x00: Ignore set_state(STATE_SLEEP) failure
Some hardware never seem to accept the "goto sleep" command, since the legacy
drivers don't have suspend and resume handlers the entire code for it was
basically a educated guess (based on the "enable radio" code).
This patch will only print a warning when the "goto sleep" command fails, and
just continues as usual. Perhaps that means the device will not reach a sleep
state and consumes more power then it should, but it is equally possible it
simply needs some seconds longer to sleep. Anyway, by making the command
non-fatal it will not block the rest of the suspend procedure.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index bd305f7..e873a39 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -1393,11 +1393,20 @@
exit:
/*
- * Set device mode to sleep for power management.
+ * Set device mode to sleep for power management,
+ * on some hardware this call seems to consistently fail.
+ * From the specifications it is hard to tell why it fails,
+ * and if this is a "bad thing".
+ * Overall it is safe to just ignore the failure and
+ * continue suspending. The only downside is that the
+ * device will not be in optimal power save mode, but with
+ * the radio and the other components already disabled the
+ * device is as good as disabled.
*/
retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
if (retval)
- return retval;
+ WARNING(rt2x00dev, "Device failed to enter sleep state, "
+ "continue suspending.\n");
return 0;
}
