[PATCH RESEND v2 0/2] net: convert remaining CAN protocols to getsockopt_iter

[Breno Leitao]

Continue the conversion of socket protocols to the new getsockopt_iter
API by covering the two remaining CAN implementations:

  - isotp (CAN ISO-TP)
  - j1939 (SAE J1939)

With these, all CAN protocols that expose a getsockopt callback (raw,
isotp, j1939) now use .getsockopt_iter; raw was converted as part of
an earlier series.

These are mechanical, ABI-preserving conversions following the same
pattern as previously converted protocols (af_packet, can/raw,
af_netlink, af_vsock):

  - The (char __user *optval, int __user *optlen) pair is replaced with
    a single sockopt_t *opt that carries the buffer length on input and
    the returned size on output, and exposes an iov_iter for the
    copy-out path.
  - put_user()/copy_to_user() pairs are replaced with a single
    copy_to_iter() per option.
  - The wrapper in do_sock_getsockopt() handles writing optlen back to
    userspace.

No functional or ABI change is intended.

For more context about the motivation for this change, please check
commit 67fab22a7ad ("net: add getsockopt_iter callback to proto_ops")

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
Changes in v2:
- Rebase on net-next, no code change
- Collect Acked-by from Oleksij Rempel and Oliver Hartkopp
- Link to v1: https://patch.msgid.link/20260507-getsock_two_can-v1-0-3c2ae9edfadc@xxxxxxxxxx

---
Breno Leitao (2):
      can: j1939: convert to getsockopt_iter
      can: isotp: convert to getsockopt_iter

 net/can/isotp.c        | 12 +++++-------
 net/can/j1939/socket.c | 21 +++++++++++++--------
 2 files changed, 18 insertions(+), 15 deletions(-)
---
base-commit: fa5196392691051963726787944db872420dfa75
base-tree: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main
change-id: 20260507-getsock_two_can-5d3604b1982f

Best regards,
--  
Breno Leitao <leitao@xxxxxxxxxx>