From: Jiri Pirko <jiri@nvidia.com>
Date: Sat, 16 Jul 2022 13:02:39 +0200
Subject: net: devlink: add unlocked variants of
 devlink_region_create/destroy() functions
Patch-mainline: v6.0-rc1
Git-commit: eb0e9fa2c6355e744d3ea7d07d34d89a4735320e
References: jsc#PED-1549

Add unlocked variants of devlink_region_create/destroy() functions
to be used in drivers called-in with devlink->lock held.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/devlink.h |    5 ++
 net/core/devlink.c    |   89 ++++++++++++++++++++++++++++++++++----------------
 2 files changed, 66 insertions(+), 28 deletions(-)

--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1681,6 +1681,10 @@ int devlink_param_driverinit_value_get(s
 int devlink_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
 				       union devlink_param_value init_val);
 void devlink_param_value_changed(struct devlink *devlink, u32 param_id);
+struct devlink_region *devl_region_create(struct devlink *devlink,
+					  const struct devlink_region_ops *ops,
+					  u32 region_max_snapshots,
+					  u64 region_size);
 struct devlink_region *
 devlink_region_create(struct devlink *devlink,
 		      const struct devlink_region_ops *ops,
@@ -1689,6 +1693,7 @@ struct devlink_region *
 devlink_port_region_create(struct devlink_port *port,
 			   const struct devlink_port_region_ops *ops,
 			   u32 region_max_snapshots, u64 region_size);
+void devl_region_destroy(struct devlink_region *region);
 void devlink_region_destroy(struct devlink_region *region);
 void devlink_port_region_destroy(struct devlink_region *region);
 
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -11294,36 +11294,31 @@ void devlink_param_value_changed(struct
 EXPORT_SYMBOL_GPL(devlink_param_value_changed);
 
 /**
- *	devlink_region_create - create a new address region
+ * devl_region_create - create a new address region
  *
- *	@devlink: devlink
- *	@ops: region operations and name
- *	@region_max_snapshots: Maximum supported number of snapshots for region
- *	@region_size: size of region
+ * @devlink: devlink
+ * @ops: region operations and name
+ * @region_max_snapshots: Maximum supported number of snapshots for region
+ * @region_size: size of region
  */
-struct devlink_region *
-devlink_region_create(struct devlink *devlink,
-		      const struct devlink_region_ops *ops,
-		      u32 region_max_snapshots, u64 region_size)
+struct devlink_region *devl_region_create(struct devlink *devlink,
+					  const struct devlink_region_ops *ops,
+					  u32 region_max_snapshots,
+					  u64 region_size)
 {
 	struct devlink_region *region;
-	int err = 0;
+
+	devl_assert_locked(devlink);
 
 	if (WARN_ON(!ops) || WARN_ON(!ops->destructor))
 		return ERR_PTR(-EINVAL);
 
-	devl_lock(devlink);
-
-	if (devlink_region_get_by_name(devlink, ops->name)) {
-		err = -EEXIST;
-		goto unlock;
-	}
+	if (devlink_region_get_by_name(devlink, ops->name))
+		return ERR_PTR(-EEXIST);
 
 	region = kzalloc(sizeof(*region), GFP_KERNEL);
-	if (!region) {
-		err = -ENOMEM;
-		goto unlock;
-	}
+	if (!region)
+		return ERR_PTR(-ENOMEM);
 
 	region->devlink = devlink;
 	region->max_snapshots = region_max_snapshots;
@@ -11333,12 +11328,32 @@ devlink_region_create(struct devlink *de
 	list_add_tail(&region->list, &devlink->region_list);
 	devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_NEW);
 
-	devl_unlock(devlink);
 	return region;
+}
+EXPORT_SYMBOL_GPL(devl_region_create);
 
-unlock:
+/**
+ *	devlink_region_create - create a new address region
+ *
+ *	@devlink: devlink
+ *	@ops: region operations and name
+ *	@region_max_snapshots: Maximum supported number of snapshots for region
+ *	@region_size: size of region
+ *
+ *	Context: Takes and release devlink->lock <mutex>.
+ */
+struct devlink_region *
+devlink_region_create(struct devlink *devlink,
+		      const struct devlink_region_ops *ops,
+		      u32 region_max_snapshots, u64 region_size)
+{
+	struct devlink_region *region;
+
+	devl_lock(devlink);
+	region = devl_region_create(devlink, ops, region_max_snapshots,
+				    region_size);
 	devl_unlock(devlink);
-	return ERR_PTR(err);
+	return region;
 }
 EXPORT_SYMBOL_GPL(devlink_region_create);
 
@@ -11349,6 +11364,8 @@ EXPORT_SYMBOL_GPL(devlink_region_create)
  *	@ops: region operations and name
  *	@region_max_snapshots: Maximum supported number of snapshots for region
  *	@region_size: size of region
+ *
+ *	Context: Takes and release devlink->lock <mutex>.
  */
 struct devlink_region *
 devlink_port_region_create(struct devlink_port *port,
@@ -11394,16 +11411,16 @@ unlock:
 EXPORT_SYMBOL_GPL(devlink_port_region_create);
 
 /**
- *	devlink_region_destroy - destroy address region
+ * devl_region_destroy - destroy address region
  *
- *	@region: devlink region to destroy
+ * @region: devlink region to destroy
  */
-void devlink_region_destroy(struct devlink_region *region)
+void devl_region_destroy(struct devlink_region *region)
 {
 	struct devlink *devlink = region->devlink;
 	struct devlink_snapshot *snapshot, *ts;
 
-	devl_lock(devlink);
+	devl_assert_locked(devlink);
 
 	/* Free all snapshots of region */
 	list_for_each_entry_safe(snapshot, ts, &region->snapshot_list, list)
@@ -11412,9 +11429,25 @@ void devlink_region_destroy(struct devli
 	list_del(&region->list);
 
 	devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_DEL);
-	devl_unlock(devlink);
 	kfree(region);
 }
+EXPORT_SYMBOL_GPL(devl_region_destroy);
+
+/**
+ *	devlink_region_destroy - destroy address region
+ *
+ *	@region: devlink region to destroy
+ *
+ *	Context: Takes and release devlink->lock <mutex>.
+ */
+void devlink_region_destroy(struct devlink_region *region)
+{
+	struct devlink *devlink = region->devlink;
+
+	devl_lock(devlink);
+	devl_region_destroy(region);
+	devl_unlock(devlink);
+}
 EXPORT_SYMBOL_GPL(devlink_region_destroy);
 
 /**