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Date: Fri, 26 Apr 2019 09:32:20 +0200
From: Esben Haabendal <esben@...nix.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Michal Simek <michal.simek@...inx.com>,
YueHaibing <yuehaibing@...wei.com>,
Luis Chamberlain <mcgrof@...nel.org>,
Yang Wei <yang.wei9@....com.cn>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 01/12] net: ll_temac: Fix and simplify error handling by using devres functions
As a side effect, a few error cases are fixed.
If of_iomap() of sdma_regs failed, no error code was returned. Fixed to
return -ENOMEM similar to of_iomap() fail of regs.
If sysfs_create_group() or register_netdev() failed, lp->phy_node was not
released.
Finally, the order in remove function is corrected to be reverse order
of what is done in probe, i.e. calling temac_mdio_teardown() last, so we
unregister the netdev that most likely is using the mdio_bus first.
Signed-off-by: Esben Haabendal <esben@...nix.com>
---
drivers/net/ethernet/xilinx/ll_temac.h | 2 +-
drivers/net/ethernet/xilinx/ll_temac_main.c | 48 ++++++++++-------------------
drivers/net/ethernet/xilinx/ll_temac_mdio.c | 14 +++------
3 files changed, 22 insertions(+), 42 deletions(-)
diff --git a/drivers/net/ethernet/xilinx/ll_temac.h b/drivers/net/ethernet/xilinx/ll_temac.h
index 1075752..4557578 100644
--- a/drivers/net/ethernet/xilinx/ll_temac.h
+++ b/drivers/net/ethernet/xilinx/ll_temac.h
@@ -378,7 +378,7 @@ void temac_indirect_out32(struct temac_local *lp, int reg, u32 value);
/* xilinx_temac_mdio.c */
-int temac_mdio_setup(struct temac_local *lp, struct device_node *np);
+int temac_mdio_setup(struct temac_local *lp, struct platform_device *pdev);
void temac_mdio_teardown(struct temac_local *lp);
#endif /* XILINX_LL_TEMAC_H */
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 44efffb..c4e85a9 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -225,7 +225,6 @@ static void temac_dma_bd_release(struct net_device *ndev)
dma_free_coherent(ndev->dev.parent,
sizeof(*lp->tx_bd_v) * TX_BD_NUM,
lp->tx_bd_v, lp->tx_bd_p);
- kfree(lp->rx_skb);
}
/**
@@ -237,7 +236,8 @@ static int temac_dma_bd_init(struct net_device *ndev)
struct sk_buff *skb;
int i;
- lp->rx_skb = kcalloc(RX_BD_NUM, sizeof(*lp->rx_skb), GFP_KERNEL);
+ lp->rx_skb = devm_kcalloc(&ndev->dev, RX_BD_NUM, sizeof(*lp->rx_skb),
+ GFP_KERNEL);
if (!lp->rx_skb)
goto out;
@@ -987,7 +987,7 @@ static int temac_of_probe(struct platform_device *op)
int rc = 0;
/* Init network device structure */
- ndev = alloc_etherdev(sizeof(*lp));
+ ndev = devm_alloc_etherdev(&pdev->dev, sizeof(*lp));
if (!ndev)
return -ENOMEM;
@@ -1020,11 +1020,10 @@ static int temac_of_probe(struct platform_device *op)
mutex_init(&lp->indirect_mutex);
/* map device registers */
- lp->regs = of_iomap(op->dev.of_node, 0);
+ lp->regs = devm_of_iomap(&op->dev, op->dev.of_node, 0, NULL);
if (!lp->regs) {
dev_err(&op->dev, "could not map temac regs.\n");
- rc = -ENOMEM;
- goto nodev;
+ return -ENOMEM;
}
/* Setup checksum offload, but default to off if not specified */
@@ -1043,15 +1042,14 @@ static int temac_of_probe(struct platform_device *op)
np = of_parse_phandle(op->dev.of_node, "llink-connected", 0);
if (!np) {
dev_err(&op->dev, "could not find DMA node\n");
- rc = -ENODEV;
- goto err_iounmap;
+ return -ENODEV;
}
/* Setup the DMA register accesses, could be DCR or memory mapped */
if (temac_dcr_setup(lp, op, np)) {
/* no DCR in the device tree, try non-DCR */
- lp->sdma_regs = of_iomap(np, 0);
+ lp->sdma_regs = devm_of_iomap(&op->dev, np, 0, NULL);
if (lp->sdma_regs) {
lp->dma_in = temac_dma_in32;
lp->dma_out = temac_dma_out32;
@@ -1059,7 +1057,7 @@ static int temac_of_probe(struct platform_device *op)
} else {
dev_err(&op->dev, "unable to map DMA registers\n");
of_node_put(np);
- goto err_iounmap;
+ return -ENOMEM;
}
}
@@ -1070,8 +1068,7 @@ static int temac_of_probe(struct platform_device *op)
if (!lp->rx_irq || !lp->tx_irq) {
dev_err(&op->dev, "could not determine irqs\n");
- rc = -ENOMEM;
- goto err_iounmap_2;
+ return -ENOMEM;
}
@@ -1079,12 +1076,11 @@ static int temac_of_probe(struct platform_device *op)
addr = of_get_mac_address(op->dev.of_node);
if (!addr) {
dev_err(&op->dev, "could not find MAC address\n");
- rc = -ENODEV;
- goto err_iounmap_2;
+ return -ENODEV;
}
temac_init_mac_address(ndev, addr);
- rc = temac_mdio_setup(lp, op->dev.of_node);
+ rc = temac_mdio_setup(lp, pdev);
if (rc)
dev_warn(&op->dev, "error registering MDIO bus\n");
@@ -1096,7 +1092,7 @@ static int temac_of_probe(struct platform_device *op)
rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
if (rc) {
dev_err(lp->dev, "Error creating sysfs files\n");
- goto err_iounmap_2;
+ goto err_sysfs_create;
}
rc = register_netdev(lp->ndev);
@@ -1107,16 +1103,11 @@ static int temac_of_probe(struct platform_device *op)
return 0;
- err_register_ndev:
+err_register_ndev:
sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
- err_iounmap_2:
- if (lp->sdma_regs)
- iounmap(lp->sdma_regs);
- err_iounmap:
- iounmap(lp->regs);
- nodev:
- free_netdev(ndev);
- ndev = NULL;
+err_sysfs_create:
+ of_node_put(lp->phy_node);
+ temac_mdio_teardown(lp);
return rc;
}
@@ -1125,15 +1116,10 @@ static int temac_of_remove(struct platform_device *op)
struct net_device *ndev = platform_get_drvdata(op);
struct temac_local *lp = netdev_priv(ndev);
- temac_mdio_teardown(lp);
unregister_netdev(ndev);
sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
of_node_put(lp->phy_node);
- lp->phy_node = NULL;
- iounmap(lp->regs);
- if (lp->sdma_regs)
- iounmap(lp->sdma_regs);
- free_netdev(ndev);
+ temac_mdio_teardown(lp);
return 0;
}
diff --git a/drivers/net/ethernet/xilinx/ll_temac_mdio.c b/drivers/net/ethernet/xilinx/ll_temac_mdio.c
index f5e83ac..a0b365e 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_mdio.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_mdio.c
@@ -57,8 +57,9 @@ static int temac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
return 0;
}
-int temac_mdio_setup(struct temac_local *lp, struct device_node *np)
+int temac_mdio_setup(struct temac_local *lp, struct platform_device *pdev)
{
+ struct device_node *np = dev_of_node(&pdev->dev);
struct mii_bus *bus;
u32 bus_hz;
int clk_div;
@@ -81,7 +82,7 @@ int temac_mdio_setup(struct temac_local *lp, struct device_node *np)
temac_indirect_out32(lp, XTE_MC_OFFSET, 1 << 6 | clk_div);
mutex_unlock(&lp->indirect_mutex);
- bus = mdiobus_alloc();
+ bus = devm_mdiobus_alloc(&pdev->dev);
if (!bus)
return -ENOMEM;
@@ -98,23 +99,16 @@ int temac_mdio_setup(struct temac_local *lp, struct device_node *np)
rc = of_mdiobus_register(bus, np);
if (rc)
- goto err_register;
+ return rc;
mutex_lock(&lp->indirect_mutex);
dev_dbg(lp->dev, "MDIO bus registered; MC:%x\n",
temac_indirect_in32(lp, XTE_MC_OFFSET));
mutex_unlock(&lp->indirect_mutex);
return 0;
-
- err_register:
- mdiobus_free(bus);
- return rc;
}
void temac_mdio_teardown(struct temac_local *lp)
{
mdiobus_unregister(lp->mii_bus);
- mdiobus_free(lp->mii_bus);
- lp->mii_bus = NULL;
}
-
--
2.4.11
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