cpuidle: use first valid target residency as poll time

mainline inclusion
from mainline-5.5
commit 36fcb429
category: feature
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=34


CVE: NA

Commit 259231a0 ("cpuidle: add poll_limit_ns to cpuidle_device
structure") changed, by mistake, the target residency from the first
available sleep state to the last available sleep state (which should
be longer).

This might cause excessive polling.

Fixes: 259231a0 ("cpuidle: add poll_limit_ns to cpuidle_device structure")
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Xiangyou Xie <xiexiangyou@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jiajun Chen <chenjiajun8@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

drivers/cpuidle/cpuidle.c

@@ -343,6 +343,7 @@ u64 cpuidle_poll_time(struct cpuidle_driver *drv,
 
 		limit_ns = (u64)drv->states[i].target_residency
 			* NSEC_PER_USEC;
+		break;
 	}
 
 	dev->poll_limit_ns = limit_ns;