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Message-ID: <532D9032.1040209@gmail.com>
Date: Sat, 22 Mar 2014 14:29:22 +0100
From: Tomasz Figa <tomasz.figa@...il.com>
To: Byungho An <bh74.an@...sung.com>, netdev@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
CC: 'David Miller' <davem@...emloft.net>,
'GIRISH K S' <ks.giri@...sung.com>,
'SIVAREDDY KALLAM' <siva.kallam@...sung.com>,
'Vipul Chandrakant' <vipul.pandya@...sung.com>,
'Ilho Lee' <ilho215.lee@...sung.com>
Subject: Re: [PATCH V11 2/7] net: sxgbe: add basic framework for Samsung 10Gb
ethernet driver
Hi,
I have reviewed the non-net-specific parts of this driver, e.g. platform
driver and Device Tree code. Please see my comments inline.
On 22.03.2014 07:23, Byungho An wrote:
> From: Siva Reddy <siva.kallam@...sung.com>
>
> This patch adds support for Samsung 10Gb ethernet driver(sxgbe).
>
> - sxgbe core initialization
> - Tx and Rx support
> - MDIO support
> - ISRs for Tx and Rx
> - ifconfig support to driver
[snip]
> diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c
> new file mode 100644
> index 0000000..95e0977
> --- /dev/null
> +++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c
[snip]
> +#ifdef CONFIG_OF
> +static int sxgbe_probe_config_dt(struct platform_device *pdev,
> + struct sxgbe_plat_data *plat,
> + const char **mac)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct sxgbe_dma_cfg *dma_cfg;
> +
> + if (!np)
> + return -ENODEV;
> +
> + *mac = of_get_mac_address(np);
> + plat->interface = of_get_phy_mode(np);
> +
> + plat->bus_id = of_alias_get_id(np, "ethernet");
> + if (plat->bus_id < 0)
> + plat->bus_id = 0;
> +
> + plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
> + sizeof(struct sxgbe_mdio_bus_data),
> + GFP_KERNEL);
If plat->mdio_bus_data is assumed to be of the same type as the data
allocated here, then the following would be preferred:
sizeof(*plat->mdio_bus_data)
Also you should probably check for allocation failure.
> +
> + dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg), GFP_KERNEL);
> + if (!dma_cfg)
> + return -ENOMEM;
> +
> + plat->dma_cfg = dma_cfg;
> + of_property_read_u32(np, "samsung,pbl", &dma_cfg->pbl);
> + if (of_property_read_u32(np, "samsung,burst-map", &dma_cfg->burst_map) == 0)
> + dma_cfg->fixed_burst = true;
> +
> + return 0;
> +}
[snip]
> +static int sxgbe_platform_probe(struct platform_device *pdev)
> +{
> + int ret;
> + int loop = 0;
> + int i, chan;
> + struct resource *res;
> + struct device *dev = &pdev->dev;
> + void __iomem *addr;
> + struct sxgbe_priv_data *priv = NULL;
> + struct sxgbe_plat_data *plat_dat = NULL;
> + const char *mac = NULL;
> + struct net_device *ndev = platform_get_drvdata(pdev);
> + struct device_node *node = dev->of_node;
> +
> + /* Get memory resource */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -ENODEV;
> +
> + addr = devm_ioremap_resource(dev, res);
> + if (IS_ERR(addr))
> + return PTR_ERR(addr);
> +
> + if (pdev->dev.of_node) {
> + plat_dat = devm_kzalloc(&pdev->dev,
> + sizeof(struct sxgbe_plat_data),
> + GFP_KERNEL);
> + if (!plat_dat)
> + return -ENOMEM;
> +
> + ret = sxgbe_probe_config_dt(pdev, plat_dat, &mac);
> + if (ret) {
> + pr_err("%s: main dt probe failed\n", __func__);
> + return ret;
> + }
> + }
> +
> + priv = sxgbe_drv_probe(&(pdev->dev), plat_dat, addr);
> + if (!priv) {
> + pr_err("%s: main driver probe failed\n", __func__);
> + return -ENODEV;
> + }
> +
> + /* Get MAC address if available (DT) */
> + if (mac)
> + ether_addr_copy(priv->dev->dev_addr, mac);
> +
> + /* Get the SXGBE common INT information */
> + priv->irq = platform_get_irq(pdev, loop++);
The name "loop" of the variable is quite misleading here. Probably
something like "irq_num", would be more meaningful.
Anyway, it doesn't look like it's used anywhere else in this function,
so platform_get_irq(pdev, 0) could be simply used.
> + if (priv->irq <= 0) {
> + dev_err(dev, "sxgbe common irq parsing failed\n");
> + sxgbe_drv_remove(ndev);
> + return -EINVAL;
> + }
> +
> + /* Get the TX/RX IRQ numbers */
> + for (i = 0, chan = 0; i < SXGBE_TX_QUEUES; i++) {
> + priv->txq[i]->irq_no = irq_of_parse_and_map(node, chan++);
Hmm, this call looks suspicious. The "chan" variable starts here as 0
and so the first call to irq_of_parse_and_map() will end up with parsing
the first (zeroth) entry of "interrupts" property, which would be the
same as returned by platform_get_irq(..., 0) above. Maybe this was the
point where the "loop" variable should be used?
Anyway, why you couldn't simply use platform_get_irq() here as well?
> + if (priv->txq[i]->irq_no <= 0) {
> + dev_err(dev, "sxgbe tx irq parsing failed\n");
Shouldn't you do some clean-up here, like calling sxgbe_drv_remove()?
Maybe moving the call to sxgbe_drv_probe() after all the resources are
successfully retrieved would be a better idea?
> + return -EINVAL;
> + }
> + }
> +
> + for (i = 0; i < SXGBE_RX_QUEUES; i++) {
> + priv->rxq[i]->irq_no = irq_of_parse_and_map(node, chan++);
> + if (priv->rxq[i]->irq_no <= 0) {
> + dev_err(dev, "sxgbe rx irq parsing failed\n");
Same comments as for TX IRQs above.
Best regards,
Tomasz
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