netdev - [PATCH net-next v2 2/2] netpoll: allocate netdev tracker right away

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Date: Mon, 12 Jun 2023 14:49:44 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	dsahern@...il.com,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2 2/2] netpoll: allocate netdev tracker right away

Commit 5fa5ae605821 ("netpoll: add net device refcount tracker to struct netpoll")
was part of one of the initial netdev tracker introduction patches.
It added an explicit netdev_tracker_alloc() for netpoll, presumably
because the flow of the function is somewhat odd.
After most of the core networking stack was converted to use
the tracking hold() variants, netpoll's call to old dev_hold()
stands out a bit.

np is allocated by the caller and ready to use, we can use
netdev_hold() here, even tho np->ndev will only be set to
ndev inside __netpoll_setup().

Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 net/core/netpoll.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index e6a739b1afa9..543007f159f9 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -690,7 +690,7 @@ int netpoll_setup(struct netpoll *np)
 		err = -ENODEV;
 		goto unlock;
 	}
-	dev_hold(ndev);
+	netdev_hold(ndev, &np->dev_tracker, GFP_KERNEL);

 	if (netdev_master_upper_dev_get(ndev)) {
 		np_err(np, "%s is a slave device, aborting\n", np->dev_name);
@@ -783,12 +783,11 @@ int netpoll_setup(struct netpoll *np)
 	err = __netpoll_setup(np, ndev);
 	if (err)
 		goto put;
-	netdev_tracker_alloc(ndev, &np->dev_tracker, GFP_KERNEL);
 	rtnl_unlock();
 	return 0;

 put:
-	dev_put(ndev);
+	netdev_put(ndev, &np->dev_tracker);
 unlock:
 	rtnl_unlock();
 	return err;
-- 
2.40.1