openwrtv3/target/linux/generic/backport-4.9/071-v4.10-0001-net-bgmac-allocate-struct-bgmac-just-once-don-t-copy.patch

From 34a5102c3235c470a6c77fba16cb971964d9c136 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Tue, 31 Jan 2017 19:37:54 +0100
Subject: [PATCH 1/3] net: bgmac: allocate struct bgmac just once & don't copy
 it
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

So far were were allocating struct bgmac in 3 places: platform code,
bcma code and shared bgmac_enet_probe function. The reason for this was
bgmac_enet_probe:
1) Requiring early-filled struct bgmac
2) Calling alloc_etherdev on its own in order to use netdev_priv later

This solution got few drawbacks:
1) Was duplicating allocating code
2) Required copying early-filled struct
3) Resulted in platform/bcma code having access only to unused struct

Solve this situation by simply extracting some probe code into the new
bgmac_alloc function.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/broadcom/bgmac-bcma.c     |  4 +---
 drivers/net/ethernet/broadcom/bgmac-platform.c |  2 +-
 drivers/net/ethernet/broadcom/bgmac.c          | 25 +++++++++++++++++--------
 drivers/net/ethernet/broadcom/bgmac.h          |  3 ++-
 4 files changed, 21 insertions(+), 13 deletions(-)

--- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -99,12 +99,11 @@ static int bgmac_probe(struct bcma_devic
 	u8 *mac;
 	int err;
 
-	bgmac = kzalloc(sizeof(*bgmac), GFP_KERNEL);
+	bgmac = bgmac_alloc(&core->dev);
 	if (!bgmac)
 		return -ENOMEM;
 
 	bgmac->bcma.core = core;
-	bgmac->dev = &core->dev;
 	bgmac->dma_dev = core->dma_dev;
 	bgmac->irq = core->irq;
 
@@ -285,7 +284,6 @@ static int bgmac_probe(struct bcma_devic
 err1:
 	bcma_mdio_mii_unregister(bgmac->mii_bus);
 err:
-	kfree(bgmac);
 	bcma_set_drvdata(core, NULL);
 
 	return err;
--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
+++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
@@ -93,7 +93,7 @@ static int bgmac_probe(struct platform_d
 	struct resource *regs;
 	const u8 *mac_addr;
 
-	bgmac = devm_kzalloc(&pdev->dev, sizeof(*bgmac), GFP_KERNEL);
+	bgmac = bgmac_alloc(&pdev->dev);
 	if (!bgmac)
 		return -ENOMEM;
 
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1459,22 +1459,32 @@ static int bgmac_phy_connect(struct bgma
 	return 0;
 }
 
-int bgmac_enet_probe(struct bgmac *info)
+struct bgmac *bgmac_alloc(struct device *dev)
 {
 	struct net_device *net_dev;
 	struct bgmac *bgmac;
-	int err;
 
 	/* Allocation and references */
-	net_dev = alloc_etherdev(sizeof(*bgmac));
+	net_dev = devm_alloc_etherdev(dev, sizeof(*bgmac));
 	if (!net_dev)
-		return -ENOMEM;
+		return NULL;
 
 	net_dev->netdev_ops = &bgmac_netdev_ops;
 	net_dev->ethtool_ops = &bgmac_ethtool_ops;
+
 	bgmac = netdev_priv(net_dev);
-	memcpy(bgmac, info, sizeof(*bgmac));
+	bgmac->dev = dev;
 	bgmac->net_dev = net_dev;
+
+	return bgmac;
+}
+EXPORT_SYMBOL_GPL(bgmac_alloc);
+
+int bgmac_enet_probe(struct bgmac *bgmac)
+{
+	struct net_device *net_dev = bgmac->net_dev;
+	int err;
+
 	net_dev->irq = bgmac->irq;
 	SET_NETDEV_DEV(net_dev, bgmac->dev);
 
@@ -1501,7 +1511,7 @@ int bgmac_enet_probe(struct bgmac *info)
 	err = bgmac_dma_alloc(bgmac);
 	if (err) {
 		dev_err(bgmac->dev, "Unable to alloc memory for DMA\n");
-		goto err_netdev_free;
+		goto err_out;
 	}
 
 	bgmac->int_mask = BGMAC_IS_ERRMASK | BGMAC_IS_RX | BGMAC_IS_TX_MASK;
@@ -1537,8 +1547,7 @@ err_phy_disconnect:
 	phy_disconnect(net_dev->phydev);
 err_dma_free:
 	bgmac_dma_free(bgmac);
-err_netdev_free:
-	free_netdev(net_dev);
+err_out:
 
 	return err;
 }
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -515,7 +515,8 @@ struct bgmac {
 			      u32 set);
 };
 
-int bgmac_enet_probe(struct bgmac *info);
+struct bgmac *bgmac_alloc(struct device *dev);
+int bgmac_enet_probe(struct bgmac *bgmac);
 void bgmac_enet_remove(struct bgmac *bgmac);
 
 struct mii_bus *bcma_mdio_mii_register(struct bcma_device *core, u8 phyaddr);