pespin has uploaded this change for review.

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io_uring: Avoid extra reads if iofd becomes unregistered by user

The user callback (read_cb, segmentation_cb, etc.) may decide to
unregister the iofd instead of closing it. In this scenario, we should
avoid calling the callback further until the iofd is registered again.

Change-Id: I231d5a16768b730f67089090c244bcc10dc69c3a
---
M src/core/osmo_io_uring.c
M tests/osmo_io/osmo_io_test.c
2 files changed, 3 insertions(+), 3 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/00/41300/1

diff --git a/src/core/osmo_io_uring.c b/src/core/osmo_io_uring.c
index 01b8063..e4a87ad 100644
--- a/src/core/osmo_io_uring.c
+++ b/src/core/osmo_io_uring.c
@@ -359,7 +359,7 @@
 		}
 
 		/* Check for every iteration, because iofd might get unregistered/closed during receive function. */
-		if (iofd->u.uring.read.enabled && !IOFD_FLAG_ISSET(iofd, IOFD_FLAG_CLOSED))
+		if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_FD_REGISTERED) && iofd->u.uring.read.enabled)
 			iofd_handle_recv(iofd, msg, chunk, msghdr);
 		else
 			msgb_free(msg);
@@ -372,7 +372,7 @@
 		msghdr->msg[idx] = NULL;
 	}
 
-	if (iofd->u.uring.read.enabled && !IOFD_FLAG_ISSET(iofd, IOFD_FLAG_CLOSED))
+	if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_FD_REGISTERED) && iofd->u.uring.read.enabled)
 		iofd_uring_submit_recv(iofd, msghdr->action);
 
 	iofd_msghdr_free(msghdr);
diff --git a/tests/osmo_io/osmo_io_test.c b/tests/osmo_io/osmo_io_test.c
index 0812ea8..06491a7 100644
--- a/tests/osmo_io/osmo_io_test.c
+++ b/tests/osmo_io/osmo_io_test.c
@@ -280,7 +280,7 @@
 	} else {
 		OSMO_ASSERT(rc == 0);
 		file_eof_read = true;
-		osmo_iofd_close(iofd);
+		osmo_iofd_unregister(iofd);
 	}
 	talloc_free(msg);
 }

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