[PATCH v2] io_uring: check for iowq alloc_workqueue errors

[Pavel Begunkov <asml.silence@xxxxxxxxx>]

alloc_workqueue() can fail, check the result and return an error back
from io_uring_init() if anything goes wrong.

Fixes: 73eaa2b583493 ("io_uring: use private workqueue for exit work")
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---

v2: drop other patches

 io_uring/io_uring.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 263e504be4a8b..4d6d2c494046c 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3920,6 +3920,8 @@ static int __init io_uring_init(void)
 					  SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT);
 
 	iou_wq = alloc_workqueue("iou_exit", WQ_UNBOUND, 64);
+	if (!iou_wq)
+		return -ENOMEM;
 
 #ifdef CONFIG_SYSCTL
 	register_sysctl_init("kernel", kernel_io_uring_disabled_table);
-- 
2.47.1