[PATCH 7.1 1379/2077] afs: Fix callback service message parsers to pass through -EAGAIN

[Greg Kroah-Hartman]

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells at redhat.com>

[ Upstream commit 0f36469d7ce98b362934113c550d08bb0c784231 ]

The AFS filesystem client uses an rxrpc server to listen for callback
notifications.  Each callback call type handler has a delivery function
that parses the incoming request stream, and this should return -EAGAIN the
last packet hasn't yet been seen, but all currently queued received data is
consumed.  afs_extract_data() does this, but the -EAGAIN return is switched
to 0 inadvertantly

Fix callback service message parsers to pass through -EAGAIN

Fixes: d001648ec7cf ("rxrpc: Don't expose skbs to in-kernel users [ver #2]")
Closes: https://sashiko.dev/#/patchset/20260609081738.770127-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells at redhat.com>
Link: https://patch.msgid.link/20260622090856.2746629-14-dhowells@redhat.com
cc: Marc Dionne <marc.dionne at auristor.com>
cc: linux-afs at lists.infradead.org
Signed-off-by: Christian Brauner (Amutable) <brauner at kernel.org>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 fs/afs/cmservice.c |    2 --
 1 file changed, 2 deletions(-)

--- a/fs/afs/cmservice.c
+++ b/fs/afs/cmservice.c
@@ -334,7 +334,6 @@ static int afs_deliver_cb_init_call_back
 		ret = afs_extract_data(call, false);
 		switch (ret) {
 		case 0:		break;
-		case -EAGAIN:	return 0;
 		default:	return ret;
 		}
 
@@ -456,7 +455,6 @@ static int afs_deliver_cb_probe_uuid(str
 		ret = afs_extract_data(call, false);
 		switch (ret) {
 		case 0:		break;
-		case -EAGAIN:	return 0;
 		default:	return ret;
 		}