From: Joe Thornber <ejt@redhat.com>
Date: Thu, 11 May 2017 10:14:16 +0000 (-0400)
Subject: dm cache: fix incorrect 'idle_time' reset in IO tracker
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=072792dcdfc8d5f91a26050e5665285f50afebf5;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

dm cache: fix incorrect 'idle_time' reset in IO tracker

Some bios have no payload (eg, a FLUSH), don't reset the idle_time when
these come in.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1db375f50a13..0760ba409c21 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -94,6 +94,9 @@ static void iot_io_begin(struct io_tracker *iot, sector_t len)
 
 static void __iot_io_end(struct io_tracker *iot, sector_t len)
 {
+	if (!len)
+		return;
+
 	iot->in_flight -= len;
 	if (!iot->in_flight)
 		iot->idle_time = jiffies;