[PATCH blktests 2/4] tests/nvmeof-mp/rc: Make simulate_network_failure_loop() more robust

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

Avoid that the following is logged in the nvmeof-mp .full log files:

ls: cannot access '/sys/class/nvme/*/device/*/nvme0n1/reset_controller': No such
file or directory
tests/nvmeof-mp/rc: line 124: : No such file or directory

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 tests/nvmeof-mp/rc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tests/nvmeof-mp/rc b/tests/nvmeof-mp/rc
index 9324dd1e8e4f..7352b1628cd3 100755
--- a/tests/nvmeof-mp/rc
+++ b/tests/nvmeof-mp/rc
@@ -117,8 +117,9 @@ simulate_network_failure_loop() {
 	while [ $rc = 0 ]; do
 		sleep_until 5 ${deadline} || break
 		for d in $(held_by "$dev"); do
-			sf=$(ls -d /sys/class/nvme/*/device/*/"${d#/dev/}/reset_controller")
-			echo 1 > "$sf"
+			for sf in /sys/class/nvme/*/device/*/"${d#/dev/}/reset_controller"; do
+				[ -e "$sf" ] && echo 1 > "$sf"
+			done
 		done
 	done 2>>"$FULL"
 
-- 
2.22.0.770.g0f2c4a37fd-goog