[PATCH V2 1/3] net: bgmac: allocate struct bgmac just once & don't copy it

[Rafał Miłecki]

From: Rafał Miłecki <ra...@milecki.pl>

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 <ra...@milecki.pl>
---
V2: Add bgmac_alloc function instead of hacking alloc_etherdev and netdev_priv

Important: this patch depends on:
[PATCH net-next] net: add devm version of alloc_etherdev_mqs function
and is the first user of devm_alloc_etherdev.
---
 drivers/net/ethernet/broadcom/bgmac-bcma.c     |  4 +---
 drivers/net/ethernet/broadcom/bgmac-platform.c |  2 +-
 drivers/net/ethernet/broadcom/bgmac.c          | 24 ++++++++++++++++--------
 drivers/net/ethernet/broadcom/bgmac.h          |  3 ++-
 4 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bgmac-bcma.c 
b/drivers/net/ethernet/broadcom/bgmac-bcma.c
index 4a4ffc0c4c65..9281abda4026 100644
--- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -117,12 +117,11 @@ static int bgmac_probe(struct bcma_device *core)
        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;
 
@@ -307,7 +306,6 @@ static int bgmac_probe(struct bcma_device *core)
 err1:
        bcma_mdio_mii_unregister(bgmac->mii_bus);
 err:
-       kfree(bgmac);
        bcma_set_drvdata(core, NULL);
 
        return err;
diff --git a/drivers/net/ethernet/broadcom/bgmac-platform.c 
b/drivers/net/ethernet/broadcom/bgmac-platform.c
index 6f736c19872f..805e6ed6c390 100644
--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
+++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
@@ -151,7 +151,7 @@ static int bgmac_probe(struct platform_device *pdev)
        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;
 
diff --git a/drivers/net/ethernet/broadcom/bgmac.c 
b/drivers/net/ethernet/broadcom/bgmac.c
index 0e066dc6b8cc..632d4d7b5a5b 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1446,22 +1446,31 @@ int bgmac_phy_connect_direct(struct bgmac *bgmac)
 }
 EXPORT_SYMBOL_GPL(bgmac_phy_connect_direct);
 
-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;
+}
+
+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);
 
@@ -1488,7 +1497,7 @@ 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;
@@ -1521,8 +1530,7 @@ int bgmac_enet_probe(struct bgmac *info)
        phy_disconnect(net_dev->phydev);
 err_dma_free:
        bgmac_dma_free(bgmac);
-err_netdev_free:
-       free_netdev(net_dev);
+err_out:
 
        return err;
 }
diff --git a/drivers/net/ethernet/broadcom/bgmac.h 
b/drivers/net/ethernet/broadcom/bgmac.h
index 71f493f2451f..dfebaded3b52 100644
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -517,7 +517,8 @@ struct bgmac {
        int (*phy_connect)(struct bgmac *bgmac);
 };
 
-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);
 void bgmac_adjust_link(struct net_device *net_dev);
 int bgmac_phy_connect_direct(struct bgmac *bgmac);
-- 
2.11.0