[PATCH v2 1/3] fsstress: check io_uring_queue_init errno properly

[Zorro Lang <zlang@kernel.org>]

As the manual of io_uring_queue_init says "io_uring_queue_init(3)
returns 0 on success and -errno on failure". We should check if the
return value is -ENOSYS, not the errno.

Fixes: d15b1721f284 ("ltp/fsstress: don't fail on io_uring ENOSYS")
Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
---
 ltp/fsstress.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/ltp/fsstress.c b/ltp/fsstress.c
index 63c75767..4fc50efb 100644
--- a/ltp/fsstress.c
+++ b/ltp/fsstress.c
@@ -763,13 +763,17 @@ int main(int argc, char **argv)
 #ifdef URING
 			have_io_uring = true;
 			/* If ENOSYS, just ignore uring, other errors are fatal. */
-			if (io_uring_queue_init(URING_ENTRIES, &ring, 0)) {
-				if (errno == ENOSYS) {
-					have_io_uring = false;
-				} else {
-					fprintf(stderr, "io_uring_queue_init failed\n");
-					exit(1);
-				}
+			c = io_uring_queue_init(URING_ENTRIES, &ring, 0);
+			switch(c){
+			case 0:
+				have_io_uring = true;
+				break;
+			case -ENOSYS:
+				have_io_uring = false;
+				break;
+			default:
+				fprintf(stderr, "io_uring_queue_init failed\n");
+				exit(1);
 			}
 #endif
 			for (i = 0; keep_looping(i, loops); i++)
-- 
2.43.0