From: Jin Qian <jinqian@google.com>
Date: Wed, 18 Jan 2017 01:26:07 +0000 (-0800)
Subject: ANDROID: uid_sys_stats: allow writing same state
X-Git-Tag: release-20171130_firefly~4^2~100^2~213
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6309385d125045325813495274a0965fc353fd9b;p=firefly-linux-kernel-4.4.55.git

ANDROID: uid_sys_stats: allow writing same state

Signed-off-by: Jin Qian <jinqian@google.com>
Bug: 34360629
Change-Id: Ia748351e07910b1febe54f0484ca1be58c4eb9c7
---

diff --git a/drivers/misc/uid_sys_stats.c b/drivers/misc/uid_sys_stats.c
index f5135bb01a7a..5f82d17e7ad9 100644
--- a/drivers/misc/uid_sys_stats.c
+++ b/drivers/misc/uid_sys_stats.c
@@ -339,11 +339,16 @@ static ssize_t uid_procstat_write(struct file *file,
 	mutex_lock(&uid_lock);
 
 	uid_entry = find_or_register_uid(uid);
-	if (!uid_entry || uid_entry->state == state) {
+	if (!uid_entry) {
 		mutex_unlock(&uid_lock);
 		return -EINVAL;
 	}
 
+	if (uid_entry->state == state) {
+		mutex_unlock(&uid_lock);
+		return count;
+	}
+
 	update_io_stats_locked();
 
 	uid_entry->state = state;