Re: [PATCH v6 1/5] misc: Add Synopsys DesignWare xData IP driver

Greg Kroah-Hartman
2021-03-23T13:01:00Z

On Fri, Feb 12, 2021 at 06:28:03PM +0100, Gustavo Pimentel wrote:
> +static const struct attribute_group xdata_attr_group = {
> + .attrs = default_attrs,
> + .name = DW_XDATA_DRIVER_NAME,
> +};

ATTRIBUTE_GROUPS()?

> +static int dw_xdata_pcie_probe(struct pci_dev *pdev,
> + const struct pci_device_id *pid)
> +{
> + const struct dw_xdata_pcie_data *pdata = (void *)pid->driver_data;
> + struct dw_xdata *dw;
> + u64 addr;
> + int err;
> +
> + /* Enable PCI device */
> + err = pcim_enable_device(pdev);
> + if (err) {
> + pci_err(pdev, "enabling device failed\n");
> + return err;
> + }
> +
> + /* Mapping PCI BAR regions */
> + err = pcim_iomap_regions(pdev, BIT(pdata->rg_bar), pci_name(pdev));
> + if (err) {
> + pci_err(pdev, "xData BAR I/O remapping failed\n");
> + return err;
> + }
> +
> + pci_set_master(pdev);
> +
> + /* Allocate memory */
> + dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
> + if (!dw)
> + return -ENOMEM;
> +
> + /* Data structure initialization */
> + mutex_init(&dw->mutex);
> +
> + dw->rg_region.vaddr = pcim_iomap_table(pdev)[pdata->rg_bar];
> + if (!dw->rg_region.vaddr)
> + return -ENOMEM;
> +
> + dw->rg_region.vaddr += pdata->rg_off;
> + dw->rg_region.paddr = pdev->resource[pdata->rg_bar].start;
> + dw->rg_region.paddr += pdata->rg_off;
> + dw->rg_region.sz = pdata->rg_sz;
> +
> + dw->max_wr_len = pcie_get_mps(pdev);
> + dw->max_wr_len >>= 2;
> +
> + dw->max_rd_len = pcie_get_readrq(pdev);
> + dw->max_rd_len >>= 2;
> +
> + dw->pdev = pdev;
> +
> + writel(0x0, &(__dw_regs(dw)->RAM_addr));
> + writel(0x0, &(__dw_regs(dw)->RAM_port));
> +
> + addr = dw->rg_region.paddr + DW_XDATA_EP_MEM_OFFSET;
> + writel(lower_32_bits(addr), &(__dw_regs(dw)->addr_lsb));
> + writel(upper_32_bits(addr), &(__dw_regs(dw)->addr_msb));
> + pci_dbg(pdev, "xData: target address = 0x%.16llx\n", addr);
> +
> + pci_dbg(pdev, "xData: wr_len=%zu, rd_len=%zu\n",
> + dw->max_wr_len * 4, dw->max_rd_len * 4);
> +
> + /* Saving data structure reference */
> + pci_set_drvdata(pdev, dw);
> +
> + /* Sysfs */
> + err = sysfs_create_group(&pdev->dev.kobj, &xdata_attr_group);

You just raced with userspace and lost :(

Have the driver core properly create/remove your sysfs files, set the
default groups pointer in your driver and all will be fine.

thanks,

greg k-h