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

   1 From 34a5102c3235c470a6c77fba16cb971964d9c136 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Tue, 31 Jan 2017 19:37:54 +0100
   4 Subject: [PATCH 1/3] net: bgmac: allocate struct bgmac just once & don't copy
   5  it
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 So far were were allocating struct bgmac in 3 places: platform code,
  11 bcma code and shared bgmac_enet_probe function. The reason for this was
  12 bgmac_enet_probe:
  13 1) Requiring early-filled struct bgmac
  14 2) Calling alloc_etherdev on its own in order to use netdev_priv later
  15
  16 This solution got few drawbacks:
  17 1) Was duplicating allocating code
  18 2) Required copying early-filled struct
  19 3) Resulted in platform/bcma code having access only to unused struct
  20
  21 Solve this situation by simply extracting some probe code into the new
  22 bgmac_alloc function.
  23
  24 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  25 Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
  26 Signed-off-by: David S. Miller <davem@davemloft.net>
  27 ---
  28  drivers/net/ethernet/broadcom/bgmac-bcma.c     |  4 +---
  29  drivers/net/ethernet/broadcom/bgmac-platform.c |  2 +-
  30  drivers/net/ethernet/broadcom/bgmac.c          | 25 +++++++++++++++++--------
  31  drivers/net/ethernet/broadcom/bgmac.h          |  3 ++-
  32  4 files changed, 21 insertions(+), 13 deletions(-)
  33
  34 --- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
  35 +++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
  36 @@ -100,12 +100,11 @@ static int bgmac_probe(struct bcma_devic
  37         const u8 *mac = NULL;
  38         int err;
  39
  40 -       bgmac = kzalloc(sizeof(*bgmac), GFP_KERNEL);
  41 +       bgmac = bgmac_alloc(&core->dev);
  42         if (!bgmac)
  43                 return -ENOMEM;
  44
  45         bgmac->bcma.core = core;
  46 -       bgmac->dev = &core->dev;
  47         bgmac->dma_dev = core->dma_dev;
  48         bgmac->irq = core->irq;
  49
  50 @@ -292,7 +291,6 @@ static int bgmac_probe(struct bcma_devic
  51  err1:
  52         bcma_mdio_mii_unregister(bgmac->mii_bus);
  53  err:
  54 -       kfree(bgmac);
  55         bcma_set_drvdata(core, NULL);
  56
  57         return err;
  58 --- a/drivers/net/ethernet/broadcom/bgmac-platform.c
  59 +++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
  60 @@ -93,7 +93,7 @@ static int bgmac_probe(struct platform_d
  61         struct resource *regs;
  62         const u8 *mac_addr;
  63
  64 -       bgmac = devm_kzalloc(&pdev->dev, sizeof(*bgmac), GFP_KERNEL);
  65 +       bgmac = bgmac_alloc(&pdev->dev);
  66         if (!bgmac)
  67                 return -ENOMEM;
  68
  69 --- a/drivers/net/ethernet/broadcom/bgmac.c
  70 +++ b/drivers/net/ethernet/broadcom/bgmac.c
  71 @@ -1460,22 +1460,32 @@ static int bgmac_phy_connect(struct bgma
  72         return 0;
  73  }
  74
  75 -int bgmac_enet_probe(struct bgmac *info)
  76 +struct bgmac *bgmac_alloc(struct device *dev)
  77  {
  78         struct net_device *net_dev;
  79         struct bgmac *bgmac;
  80 -       int err;
  81
  82         /* Allocation and references */
  83 -       net_dev = alloc_etherdev(sizeof(*bgmac));
  84 +       net_dev = devm_alloc_etherdev(dev, sizeof(*bgmac));
  85         if (!net_dev)
  86 -               return -ENOMEM;
  87 +               return NULL;
  88
  89         net_dev->netdev_ops = &bgmac_netdev_ops;
  90         net_dev->ethtool_ops = &bgmac_ethtool_ops;
  91 +
  92         bgmac = netdev_priv(net_dev);
  93 -       memcpy(bgmac, info, sizeof(*bgmac));
  94 +       bgmac->dev = dev;
  95         bgmac->net_dev = net_dev;
  96 +
  97 +       return bgmac;
  98 +}
  99 +EXPORT_SYMBOL_GPL(bgmac_alloc);
 100 +
 101 +int bgmac_enet_probe(struct bgmac *bgmac)
 102 +{
 103 +       struct net_device *net_dev = bgmac->net_dev;
 104 +       int err;
 105 +
 106         net_dev->irq = bgmac->irq;
 107         SET_NETDEV_DEV(net_dev, bgmac->dev);
 108
 109 @@ -1502,7 +1512,7 @@ int bgmac_enet_probe(struct bgmac *info)
 110         err = bgmac_dma_alloc(bgmac);
 111         if (err) {
 112                 dev_err(bgmac->dev, "Unable to alloc memory for DMA\n");
 113 -               goto err_netdev_free;
 114 +               goto err_out;
 115         }
 116
 117         bgmac->int_mask = BGMAC_IS_ERRMASK | BGMAC_IS_RX | BGMAC_IS_TX_MASK;
 118 @@ -1538,8 +1548,7 @@ err_phy_disconnect:
 119         phy_disconnect(net_dev->phydev);
 120  err_dma_free:
 121         bgmac_dma_free(bgmac);
 122 -err_netdev_free:
 123 -       free_netdev(net_dev);
 124 +err_out:
 125
 126         return err;
 127  }
 128 --- a/drivers/net/ethernet/broadcom/bgmac.h
 129 +++ b/drivers/net/ethernet/broadcom/bgmac.h
 130 @@ -515,7 +515,8 @@ struct bgmac {
 131                               u32 set);
 132  };
 133
 134 -int bgmac_enet_probe(struct bgmac *info);
 135 +struct bgmac *bgmac_alloc(struct device *dev);
 136 +int bgmac_enet_probe(struct bgmac *bgmac);
 137  void bgmac_enet_remove(struct bgmac *bgmac);
 138
 139  struct mii_bus *bcma_mdio_mii_register(struct bcma_device *core, u8 phyaddr);