rxrpc: Fix lack of short-send handling in rxrpc_kernel_send_data()

Fix rxrpc_kernel_send_data() to loop around if it detects a short send.
David Laight suggested doing it here rather than wrapping all the calls in
loops.  Further, remove the len argument and use the iterator count instead
and return 0 on success, not the amount copied.

Note this is also a prerequisite for changing the way rxrpc_send_data()
works to return a short send rather than an error if some data was
buffered.

Fixes: 651350d10f93 ("[AF_RXRPC]: Add an interface to the AF_RXRPC module for the AFS filesystem to use")
Link: https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260824091645.415423-1-dhowells%40redhat.com
Suggested-by: David Laight <david.laight.linux@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Eric Dumazet <edumazet@google.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261006133011.531806-5-dhowells@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

0 files changed, 0 insertions, 0 deletions