[PATCH net-next V10 02/14] devlink: Add a helper for getting a nested-in instance
From: Tariq Toukan <tariqt@nvidia.com>
Date: 2026-07-01 07:34:16
Also in:
linux-doc, linux-kselftest, linux-rdma, lkml
Subsystem:
devlink, networking [general], the rest · Maintainers:
Jiri Pirko, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Cosmin Ratiu <redacted> Upcoming code will need to obtain references to locked nested-in devlink instances. Add a helper to lock, reference and return the nested-in instance. Signed-off-by: Cosmin Ratiu <redacted> Reviewed-by: Carolina Jubran <redacted> Reviewed-by: Jiri Pirko <redacted> Signed-off-by: Tariq Toukan <tariqt@nvidia.com> --- net/devlink/core.c | 16 ++++++++++++++++ net/devlink/devl_internal.h | 4 ++++ 2 files changed, 20 insertions(+)
diff --git a/net/devlink/core.c b/net/devlink/core.c
index fe9f6a0a67d5..ee26c50b4118 100644
--- a/net/devlink/core.c
+++ b/net/devlink/core.c@@ -67,6 +67,22 @@ static void __devlink_rel_put(struct devlink_rel *rel) devlink_rel_free(rel); } +struct devlink *__must_check devlink_nested_in_get_lock(struct devlink *devlink) +{ + devl_assert_locked(devlink); + if (!devlink->rel) + return NULL; + devlink = devlinks_xa_get(devlink->rel->nested_in.devlink_index); + if (!devlink) + return NULL; + devl_lock(devlink); + if (devl_is_registered(devlink)) + return devlink; + devl_unlock(devlink); + devlink_put(devlink); + return NULL; +} + static void devlink_rel_nested_in_notify_work(struct work_struct *work) { struct devlink_rel *rel = container_of(work, struct devlink_rel,
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index e4e48ee2da5a..36dff282f9b0 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h@@ -136,6 +136,10 @@ typedef void devlink_rel_notify_cb_t(struct devlink *devlink, u32 obj_index); typedef void devlink_rel_cleanup_cb_t(struct devlink *devlink, u32 obj_index, u32 rel_index); +/* Returns the locked+referenced nested-in instance or NULL. */ +struct devlink *__must_check +devlink_nested_in_get_lock(struct devlink *devlink); + void devlink_rel_nested_in_clear(u32 rel_index); int devlink_rel_nested_in_add(u32 *rel_index, u32 devlink_index, u32 obj_index, devlink_rel_notify_cb_t *notify_cb,
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2.44.0