[PATCH] cpuidle: not unset the driver if it already exist

From: Zhenzhong Duan
Date: Sun Oct 13 2019 - 20:44:22 EST

__cpuidle_set_driver() check if there is an already exist driver and
unset it before return with -EBUSY. The next call will succeed as it's
just unset. This is strange as we should either keep old driver and
return -EBUSY or unset and set new driver and return 0.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
drivers/cpuidle/driver.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 80c1a83..a200304 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -74,7 +74,6 @@ static inline int __cpuidle_set_driver(struct cpuidle_driver *drv)
for_each_cpu(cpu, drv->cpumask) {

if (__cpuidle_get_cpu_driver(cpu)) {
- __cpuidle_unset_driver(drv);
return -EBUSY;