[PATCH net-next v4 07/13] devlink: introduce __devlink_alloc() with dev driver pointer

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

Introduce __devlink_alloc() as an internal devlink allocator that
accepts a struct device_driver pointer and stores it in the devlink
instance. This allows internal devlink code (e.g. shared instances)
to associate a driver with a devlink instance without need to pass dev
pointer.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
v2->v3:
- new patch
---
 net/devlink/core.c          | 40 ++++++++++++++++++++++---------------
 net/devlink/devl_internal.h |  5 +++++
 2 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/net/devlink/core.c b/net/devlink/core.c
index 237558abcd63..fcb73d3e56aa 100644
--- a/net/devlink/core.c
+++ b/net/devlink/core.c
@@ -418,27 +418,15 @@ void devlink_unregister(struct devlink *devlink)
 }
 EXPORT_SYMBOL_GPL(devlink_unregister);
 
-/**
- *	devlink_alloc_ns - Allocate new devlink instance resources
- *	in specific namespace
- *
- *	@ops: ops
- *	@priv_size: size of user private data
- *	@net: net namespace
- *	@dev: parent device
- *
- *	Allocate new devlink instance resources, including devlink index
- *	and name.
- */
-struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
-				 size_t priv_size, struct net *net,
-				 struct device *dev)
+struct devlink *__devlink_alloc(const struct devlink_ops *ops, size_t priv_size,
+				struct net *net, struct device *dev,
+				const struct device_driver *dev_driver)
 {
 	struct devlink *devlink;
 	static u32 last_id;
 	int ret;
 
-	WARN_ON(!ops || !dev);
+	WARN_ON(!ops || !dev || !dev_driver);
 	if (!devlink_reload_actions_valid(ops))
 		return NULL;
 
@@ -453,6 +441,7 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
 
 	devlink->dev = get_device(dev);
 	devlink->ops = ops;
+	devlink->dev_driver = dev_driver;
 	xa_init_flags(&devlink->ports, XA_FLAGS_ALLOC);
 	xa_init_flags(&devlink->params, XA_FLAGS_ALLOC);
 	xa_init_flags(&devlink->snapshot_ids, XA_FLAGS_ALLOC);
@@ -480,6 +469,25 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
 	kvfree(devlink);
 	return NULL;
 }
+
+/**
+ *	devlink_alloc_ns - Allocate new devlink instance resources
+ *	in specific namespace
+ *
+ *	@ops: ops
+ *	@priv_size: size of user private data
+ *	@net: net namespace
+ *	@dev: parent device
+ *
+ *	Allocate new devlink instance resources, including devlink index
+ *	and name.
+ */
+struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
+				 size_t priv_size, struct net *net,
+				 struct device *dev)
+{
+	return __devlink_alloc(ops, priv_size, net, dev, dev->driver);
+}
 EXPORT_SYMBOL_GPL(devlink_alloc_ns);
 
 /**
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index f0ebfb936770..3cc7e696e0fd 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -49,6 +49,7 @@ struct devlink {
 	struct xarray snapshot_ids;
 	struct devlink_dev_stats stats;
 	struct device *dev;
+	const struct device_driver *dev_driver;
 	possible_net_t _net;
 	/* Serializes access to devlink instance specific objects such as
 	 * port, sb, dpipe, resource, params, region, traps and more.
@@ -66,6 +67,10 @@ struct devlink {
 extern struct xarray devlinks;
 extern struct genl_family devlink_nl_family;
 
+struct devlink *__devlink_alloc(const struct devlink_ops *ops, size_t priv_size,
+				struct net *net, struct device *dev,
+				const struct device_driver *dev_driver);
+
 /* devlink instances are open to the access from the user space after
  * devlink_register() call. Such logical barrier allows us to have certain
  * expectations related to locking.
-- 
2.51.1