netdev - [patch net-next v3 3/7] devlink: take device reference for devlink object

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Date: Fri, 13 Oct 2023 14:10:25 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	pabeni@...hat.com,
	davem@...emloft.net,
	edumazet@...gle.com
Subject: [patch net-next v3 3/7] devlink: take device reference for devlink object

From: Jiri Pirko <jiri@...dia.com>

In preparation to allow to access device pointer without devlink
instance lock held, make sure the device pointer is usable until
devlink_release() is called.

Fixes: c137743bce02 ("devlink: introduce object and nested devlink relationship infra")
Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
v2->v3:
- moved the device reference related bits from "devlink: don't take
  instance lock for nested handle put"
---
 net/devlink/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/devlink/core.c b/net/devlink/core.c
index bcbbb952569f..c47c9e6c744f 100644
--- a/net/devlink/core.c
+++ b/net/devlink/core.c
@@ -310,6 +310,7 @@ static void devlink_release(struct work_struct *work)
 
 	mutex_destroy(&devlink->lock);
 	lockdep_unregister_key(&devlink->lock_key);
+	put_device(devlink->dev);
 	kfree(devlink);
 }
 
@@ -425,7 +426,7 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
 	if (ret < 0)
 		goto err_xa_alloc;
 
-	devlink->dev = dev;
+	devlink->dev = get_device(dev);
 	devlink->ops = ops;
 	xa_init_flags(&devlink->ports, XA_FLAGS_ALLOC);
 	xa_init_flags(&devlink->params, XA_FLAGS_ALLOC);
-- 
2.41.0