[PATCH 03/11] net: devres: relax devm_register_netdev()

From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Jonathan Corbet <corbet@lwn.net>,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, John Crispin <john@phrozen.org>,
	Sean Wang <sean.wang@mediatek.com>,
	Mark Lee <Mark-MC.Lee@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Realtek linux nic maintainers <nic_swsd@realtek.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org,
	Fabien Parent <fparent@baylibre.com>,
	Stephane Le Provost <stephane.leprovost@mediatek.com>,
	Pedro Tsai <pedro.tsai@mediatek.com>,
	Andrew Perepech <andrew.perepech@mediatek.com>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: [PATCH 03/11] net: devres: relax devm_register_netdev()
Date: Mon, 22 Jun 2020 12:00:48 +0200	[thread overview]
Message-ID: <20200622100056.10151-4-brgl@bgdev.pl> (raw)
In-Reply-To: <20200622100056.10151-1-brgl@bgdev.pl>

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

This devres helper registers a release callback that only unregisters
the net_device. It works perfectly fine with netdev structs that are
not managed on their own. There's no reason to check this - drop the
warning.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 net/devres.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/net/devres.c b/net/devres.c
index 57a6a88d11f6..1583ccb207c0 100644
--- a/net/devres.c
+++ b/net/devres.c
@@ -46,14 +46,6 @@ static void devm_netdev_release(struct device *dev, void *this)
 	unregister_netdev(res->ndev);
 }
 
-static int netdev_devres_match(struct device *dev, void *this, void *match_data)
-{
-	struct net_device_devres *res = this;
-	struct net_device *ndev = match_data;
-
-	return ndev == res->ndev;
-}
-
 /**
  *	devm_register_netdev - resource managed variant of register_netdev()
  *	@dev: managing device for this netdev - usually the parent device
@@ -61,22 +53,13 @@ static int netdev_devres_match(struct device *dev, void *this, void *match_data)
  *
  *	This is a devres variant of register_netdev() for which the unregister
  *	function will be call automatically when the managing device is
- *	detached. Note: the net_device used must also be resource managed by
- *	the same struct device.
+ *	detached.
  */
 int devm_register_netdev(struct device *dev, struct net_device *ndev)
 {
 	struct net_device_devres *dr;
 	int ret;
 
-	/* struct net_device must itself be managed. For now a managed netdev
-	 * can only be allocated by devm_alloc_etherdev_mqs() so the check is
-	 * straightforward.
-	 */
-	if (WARN_ON(!devres_find(dev, devm_free_netdev,
-				 netdev_devres_match, ndev)))
-		return -EINVAL;
-
 	dr = devres_alloc(devm_netdev_release, sizeof(*dr), GFP_KERNEL);
 	if (!dr)
 		return -ENOMEM;
-- 
2.26.1

