net/mlx5: devcom, Base component size on linked devices

Browse source

mlx5_devcom_comp_get_size() returns the component's kref count. That
kref is bumped in mlx5_devcom_register_component() under comp_list_lock,
before the comp_dev is linked onto comp_dev_list_head under comp->sem.
The event broadcast (mlx5_devcom_locked_send_event()) walks that list.

Hence, a caller can read the expected size, but send_event won't be sent
to all peers. In the SD group registration path, this lets a member
broadcast its role-election event over an incomplete list, electing a
primary that never completes the group, is never marked ready, and
leaves the group with a stale primary.

Track the number of linked comp_devs in a dedicated counter, maintained
under comp->sem together with the list add/remove, and return it from
mlx5_devcom_comp_get_size().

Fixes: 9bb1ac8073 ("net/mlx5: devcom, Add component size getter")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Akiva Goldberger <agoldberger@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260915113459.3934760-2-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Shay Drory 2026-09-15 14:34:57 +03:00 • committed by Jakub Kicinski

parent 39c6580765

commit d09e8f6465

1 changed files with 4 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

5

drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c

View file