[RFC PATCH 3/6] io_uring: mark iopoll not supported for uring-cmd

[Kanchan Joshi <joshi.k@xxxxxxxxxxx>]

From: Anuj Gupta <anuj20.g@xxxxxxxxxxx>

Currently uring-passthrough doesn't support iopoll. Bail out to avoid
the panic.

Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
---
 fs/io_uring.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index b73bc16c3e70..3361056313a7 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3587,6 +3587,11 @@ static int io_uring_cmd_prep(struct io_kiocb *req,
 	if (!req->file->f_op->uring_cmd)
 		return -EOPNOTSUPP;
 
+	if (req->ctx->flags & IORING_SETUP_IOPOLL) {
+		printk_once(KERN_WARNING "io_uring: iopoll not supported!\n");
+		return -EOPNOTSUPP;
+	}
+
 	cmd->op = READ_ONCE(csqe->op);
 	cmd->len = READ_ONCE(csqe->len);
 
-- 
2.25.1