--- w1_therm.c_org	2017-06-06 04:05:48.028105363 +0200
+++ w1_therm.c	2017-06-06 04:05:36.883914878 +0200
@@ -245,7 +245,7 @@
 
 			w1_write_8(dev, W1_COPY_SCRATCHPAD);
 
-			if (external_power) {
+			if (external_power && w1_strong_pullup != 2) {
 				mutex_unlock(&dev->bus_mutex);
 
 				sleep_rem = msleep_interruptible(tm);
@@ -473,7 +473,7 @@
 
 			w1_write_8(dev, W1_CONVERT_TEMP);
 
-			if (external_power) {
+			if (external_power && w1_strong_pullup != 2) {
 				mutex_unlock(&dev->bus_mutex);
 
 				sleep_rem = msleep_interruptible(tm);