[PATCH v1 09/10] devfreq: Allow showing available_governors when device governor is NULL

[Jie Zhan]

From: Zhi Wang <wangzhi12 at huawei.com>

Allow showing available_governors via sysfs when a device's governor is
NULL, enabling reconfiguration of the device's governor.

Before:
$: echo simple_ondemand > governor
$: rmmod -f governor_simpleondemand
$: cat available_governors
cat: available_governors: Invalid argument

After:
$: echo simple_ondemand > governor
$: rmmod -f governor_simpleondemand
$: cat available_governors
hisi_platform userspace powersave performance

Signed-off-by: Zhi Wang <wangzhi12 at huawei.com>
Signed-off-by: Jie Zhan <zhanjie9 at hisilicon.com>
---
 drivers/devfreq/devfreq.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index c6b670b8fd22..5aebb32e89b0 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1461,16 +1461,13 @@ static ssize_t available_governors_show(struct device *d,
 	struct devfreq *df = to_devfreq(d);
 	ssize_t count = 0;
 
-	if (!df->governor)
-		return -EINVAL;
-
 	mutex_lock(&devfreq_list_lock);
 
 	/*
 	 * The devfreq with immutable governor (e.g., passive) shows
 	 * only own governor.
 	 */
-	if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)) {
+	if (df->governor && IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)) {
 		count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
 				  "%s ", df->governor->name);
 	/*
-- 
2.43.0