[LTP] [PATCH] controllers/cgroup_regression_test.sh: Fix two issues

[Xiao Yang]

1) "umount cgroup" operation will umount pre-existent cgroup subsystem
   if "cgroup" mountpoint doesn't exist, because "cgroup" was treated
   as source(device) instead of target(mountpoint) in this case.  e.g.
   -----------------------------------------------------------
   cd /tmp
   mount -t cgroup -o cpu xxx cgroup/
   mount | egrep "cpu|pids"
   cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,pids)
   xxx on /tmp/cgroup type cgroup (rw,relatime,seclabel,cpu)
   umount cgroup
   mount | egrep "cpu|pids"
   cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,pids)
   umount cgroup
   mount | egrep "cpu|pids"
   (nothing)
   -----------------------------------------------------------

2) If pre-existent cgroup subsystem mountpoint is used, test3()
   may remove the directories that are not created by test.

Fixes: 3cac1f80d ("cgroup: cgroup_regression_test.sh ported to newlib")
Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
---
 .../controllers/cgroup/cgroup_regression_test.sh   | 28 +++++++++++-----------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
index 0e17ad1..6868609 100755
--- a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
+++ b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
@@ -37,7 +37,7 @@ do_cleanup()
 {
 	if mountpoint -q cgroup/; then
 		find cgroup/ -maxdepth 1 -depth -exec rmdir {} +
-		umount cgroup
+		umount cgroup/
 		rmdir cgroup
 	fi
 }
@@ -109,7 +109,7 @@ test1()
 
 	kill -TERM $!
 	wait $! 2>/dev/null
-	umount cgroup
+	umount cgroup/
 	check_kernel_bug
 }
 
@@ -145,7 +145,7 @@ test2()
 	fi
 
 	rmdir cgroup/0 cgroup/1
-	umount cgroup
+	umount cgroup/
 }
 
 #---------------------------------------------------------------------------
@@ -192,8 +192,8 @@ test3()
 	wait $pid1 2>/dev/null
 	wait $pid2 2>/dev/null
 
-	rmdir $cpu_subsys_path/* 2> /dev/null
-	umount cgroup 2> /dev/null
+	rmdir $cpu_subsys_path/0 2> /dev/null
+	umount cgroup/ 2> /dev/null
 	check_kernel_bug
 }
 
@@ -222,7 +222,7 @@ test4()
 	mount -t cgroup -o none,name=foo cgroup cgroup/
 	mkdir cgroup/0
 	rmdir cgroup/0
-	umount cgroup
+	umount cgroup/
 
 	if dmesg | grep -q "MAX_LOCKDEP_SUBCLASSES too low"; then
 		tst_res TFAIL "lockdep BUG was found"
@@ -285,7 +285,7 @@ test5()
 	if [ $? -eq 0 ]; then
 		tst_res TFAIL "mount $failing should fail"
 		# Do NOT unmount pre-existent mountpoints...
-		[ -z "$mounted" ] && umount $mntpoint
+		[ -z "$mounted" ] && umount $mntpoint/
 		return
 	fi
 
@@ -303,7 +303,7 @@ test5()
 	wait $! 2>/dev/null
 	rmdir $mntpoint/0
 	# Do NOT unmount pre-existent mountpoints...
-	[ -z "$mounted" ] && umount $mntpoint
+	[ -z "$mounted" ] && umount $mntpoint/
 	check_kernel_bug
 }
 
@@ -339,7 +339,7 @@ test6()
 
 	mount -t cgroup -o ns xxx cgroup/ > /dev/null 2>&1
 	rmdir cgroup/[1-9]* > /dev/null 2>&1
-	umount cgroup
+	umount cgroup/
 	check_kernel_bug
 }
 
@@ -381,7 +381,7 @@ test_7_1()
 		mount -t cgroup -o remount xxx cgroup/ 2> /dev/null
 		kill -TERM $!
 		wait $! 2>/dev/null
-		umount cgroup
+		umount cgroup/
 	fi
 }
 
@@ -404,7 +404,7 @@ test_7_2()
 	mount -t cgroup -o remount,$subsys xxx cgroup/ 2> /dev/null
 	kill -TERM $!
 	wait $! 2>/dev/null
-	umount cgroup
+	umount cgroup/
 
 	grep -q -w "cpu" /proc/cgroups
 	if [ $? -ne 0 -o ! -e /proc/sched_debug ]; then
@@ -460,7 +460,7 @@ test8()
 		tst_res TFAIL "should have failed to get cgroupstat of tasks file"
 	fi
 
-	umount cgroup
+	umount cgroup/
 	check_kernel_bug
 }
 
@@ -484,7 +484,7 @@ test9()
 	wait $pid1 2>/dev/null
 	wait $pid2 2>/dev/null
 
-	umount cgroup 2> /dev/null
+	umount cgroup/ 2> /dev/null
 	check_kernel_bug
 }
 
@@ -510,7 +510,7 @@ test10()
 	mount -t cgroup none cgroup 2> /dev/null
 	mkdir cgroup/0
 	rmdir cgroup/0
-	umount cgroup 2> /dev/null
+	umount cgroup/ 2> /dev/null
 	check_kernel_bug
 }
 
-- 
1.8.3.1