1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/sysfs.c b/drivers/gpu/nvgpu/os/linux/sysfs.c
index 84a311de..221ea0ce 100644
--- a/drivers/gpu/nvgpu/os/linux/sysfs.c
+++ b/drivers/gpu/nvgpu/os/linux/sysfs.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2019, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -266,6 +266,13 @@ static ssize_t railgate_enable_store(struct device *dev,
         if (kstrtoul(buf, 10, &railgate_enable) < 0)
                 return -EINVAL;
 
+        /* convert to boolean */
+        railgate_enable = !!railgate_enable;
+
+        /* writing same value should be treated as nop and successful */
+        if (railgate_enable == enabled)
+                goto out;
+
         if (!platform->can_railgate_init) {
                 nvgpu_err(g, "Railgating is not supported");
                 return -EINVAL;
@@ -274,7 +281,7 @@ static ssize_t railgate_enable_store(struct device *dev,
         if (railgate_enable) {
                 __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, true);
                 pm_runtime_set_autosuspend_delay(dev, g->railgate_delay);
-        } else if (railgate_enable == 0 && enabled) {
+        } else {
                 __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, false);
                 pm_runtime_set_autosuspend_delay(dev, -1);
         }
@@ -284,6 +291,7 @@ static ssize_t railgate_enable_store(struct device *dev,
                 return err;
         gk20a_idle(g);
 
+out:
         nvgpu_info(g, "railgate is %s.",
                         nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE) ?
                         "enabled" : "disabled");