Merge branch 'io-context-error-handling' into 'master'

[IoContext] Add missing error handling in submitPreparedSqesAndWait()

See merge request i4/manycore/emper!235

emper/io/IoContext.cpp

@@ -107,12 +107,7 @@ auto IoContext::submitPreparedSqesAndWait(unsigned wait_nr) -> unsigned {
 	int submitted = io_uring_submit_and_wait(&ring, wait_nr);
 
 	// Actually I don't know how "unlikely" this is
-	if (unlikely(submitted < 0)) {
-		if (unlikely(submitted != -EBUSY)) {
-			errno = -submitted;
-			DIE_MSG_ERRNO("io_uring_submit failed");
-		}
-
+	if (unlikely(submitted == -EBUSY)) {
 		// We can't submit our sqe because the CQ is full
 		// in worker thread -> reapCompletions
 		// in globalCompleter thread -> TODO: deterministically handle global full CQ
@@ -134,6 +129,11 @@ auto IoContext::submitPreparedSqesAndWait(unsigned wait_nr) -> unsigned {
 				stats.record_io_submit_full_cq);
 	}
 
+	if (unlikely(submitted < 0)) {
+		errno = -submitted;
+		DIE_MSG_ERRNO("io_uring_submit failed");
+	}
+
 	return static_cast<unsigned>(submitted);
 }