diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index fe23bf88f86f..9e6ce6d4ab51 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -32,12 +32,8 @@ enum io_uring_cmd_flags {
 struct io_uring_cmd {
 	struct file	*file;
 	const struct io_uring_sqe *sqe;
-	union {
-		/* callback to defer completions to task context */
-		void (*task_work_cb)(struct io_uring_cmd *cmd, unsigned);
-		/* used for polled completion */
-		void *cookie;
-	};
+	/* callback to defer completions to task context */
+	void (*task_work_cb)(struct io_uring_cmd *cmd, unsigned);
 	u32		cmd_op;
 	u32		flags;
 	u8		pdu[32]; /* available inline for free use */
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index acbc2924ecd2..b39ec25c36bc 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -182,7 +182,6 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
 			return -EOPNOTSUPP;
 		issue_flags |= IO_URING_F_IOPOLL;
 		req->iopoll_completed = 0;
-		WRITE_ONCE(ioucmd->cookie, NULL);
 	}
 
 	ret = file->f_op->uring_cmd(ioucmd, issue_flags);