rtio: Release sqe before submitting cqe

When an application is waiting on a completion it may be expecting,
rightfully so, that a new submissions slot is available.

Frees the submission queue event prior to enqueuing
the completion queue event in the simple executor.

Signed-off-by: Tom Burdick <thomas.burdick@intel.com>

Author: Tom Burdick

subsys/rtio/rtio_executor_simple.c

@@ -41,8 +41,10 @@ int rtio_simple_submit(struct rtio *r)
  */
 void rtio_simple_ok(struct rtio *r, const struct rtio_sqe *sqe, int result)
 {
-	rtio_cqe_submit(r, result, sqe->userdata);
+	void *userdata = sqe->userdata;
+
 	rtio_spsc_release(r->sq);
+	rtio_cqe_submit(r, result, userdata);
 	rtio_simple_submit(r);
 }
 
@@ -52,18 +54,19 @@ void rtio_simple_ok(struct rtio *r, const struct rtio_sqe *sqe, int result)
 void rtio_simple_err(struct rtio *r, const struct rtio_sqe *sqe, int result)
 {
 	struct rtio_sqe *nsqe;
-	bool chained;
+	void *userdata = sqe->userdata;
+	bool chained = sqe->flags & RTIO_SQE_CHAINED;
 
-	rtio_cqe_submit(r, result, sqe->userdata);
-	chained = sqe->flags & RTIO_SQE_CHAINED;
 	rtio_spsc_release(r->sq);
+	rtio_cqe_submit(r, result, sqe->userdata);
 
 	if (chained) {
 
 		nsqe = rtio_spsc_consume(r->sq);
 		while (nsqe != NULL && nsqe->flags & RTIO_SQE_CHAINED) {
-			rtio_cqe_submit(r, -ECANCELED, nsqe->userdata);
+			userdata = nsqe->userdata;
 			rtio_spsc_release(r->sq);
+			rtio_cqe_submit(r, -ECANCELED, userdata);
 			nsqe = rtio_spsc_consume(r->sq);
 		}