[PATCH blktests v4 1/4] Make _exit_null_blk remove all null_blk device instances

[Bart Van Assche <bvanassche@acm.org>]

Instead of making every test remove null_blk device instances before calling
_exit_null_blk(), move the null_blk device instance removal code into
_exit_null_blk().

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 common/null_blk | 7 ++++++-
 tests/block/022 | 3 ---
 tests/block/029 | 1 -
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/common/null_blk b/common/null_blk
index 2e300c20bbc7..a4140e365955 100644
--- a/common/null_blk
+++ b/common/null_blk
@@ -8,11 +8,15 @@ _have_null_blk() {
 	_have_modules null_blk
 }
 
-_init_null_blk() {
+_remove_null_blk_devices() {
 	if [[ -d /sys/kernel/config/nullb ]]; then
 		find /sys/kernel/config/nullb -mindepth 1 -maxdepth 1 \
 		     -type d -delete
 	fi
+}
+
+_init_null_blk() {
+	_remove_null_blk_devices
 
 	local zoned=""
 	if (( RUN_FOR_ZONED )); then zoned="zoned=1"; fi
@@ -26,6 +30,7 @@ _init_null_blk() {
 }
 
 _exit_null_blk() {
+	_remove_null_blk_devices
 	udevadm settle
 	modprobe -r null_blk
 }
diff --git a/tests/block/022 b/tests/block/022
index 1404aacef295..b2c53e266d81 100755
--- a/tests/block/022
+++ b/tests/block/022
@@ -50,9 +50,6 @@ test() {
 		wait $pid1
 	} 2>/dev/null
 
-	rmdir /sys/kernel/config/nullb/1
-	rmdir /sys/kernel/config/nullb/0
-
 	_exit_null_blk
 	echo "Test complete"
 }
diff --git a/tests/block/029 b/tests/block/029
index d298bac8db5c..0d521edb0cf6 100755
--- a/tests/block/029
+++ b/tests/block/029
@@ -58,7 +58,6 @@ test() {
 	else
 		echo "Skipping test because $sq cannot be modified" >>"$FULL"
 	fi
-	rmdir /sys/kernel/config/nullb/nullb0
 	_exit_null_blk
 	echo Passed
 }