linux-kernel - RE: [RESEND v4 1/6] misc: Add Synopsys DesignWare xData IP driver

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Date:   Tue, 9 Feb 2021 15:28:16 +0000
From:   Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
To:     Krzysztof Wilczyński <kw@...ux.com>
CC:     "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Bjorn Helgaas <helgaas@...nel.org>
Subject: RE: [RESEND v4 1/6] misc: Add Synopsys DesignWare xData IP driver

On Mon, Feb 8, 2021 at 22:53:54, Krzysztof Wilczyński <kw@...ux.com> 
wrote:

> [+cc Bjorn]
> 
> Hi Gustavo,
> 
> [...]
> > Thanks for your review. I will wait for a couple of days, before sending 
> > a new version of this patch series based on your feedback.
> 
> Thank you!
> 
> There might be one more change, and improvement, to be done as per
> Bjorn's feedback, see:
> 
>   https://urldefense.com/v3/__https://lore.kernel.org/linux-pci/20210208193516.GA406304@bjorn-Precision-5520/__;!!A4F2R9G_pg!Oxp56pU_UN6M2BhfNRSdYqsFUncqVklBj_1IdLQD_w_V6dKRPDO_FjPUystMa5D39SRj8uo$ 
> 
> The code in question would be (exceprt from the patch):
> 
> [...]
> +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;
> [...]
> +	dw->rg_region.vaddr = pcim_iomap_table(pdev)[pdata->rg_bar];
> +	if (!dw->rg_region.vaddr)
> +		return -ENOMEM;
> [...]
> 
> Perhaps something like the following would would?
> 
> void __iomem * const *iomap_table;
> 
> iomap_table = pcim_iomap_table(pdev);
> if (!iomap_table)
>         return -ENOMEM;
> 
> dw->rg_region.vaddr = iomap_table[pdata->rg_bar];
> if (!dw->rg_region.vaddr)
> 	return -ENOMEM;
> 
> With sensible error messages added, of course.  What do you think?

I think all the improvements are welcome. I will do that.
My only doubt is if Bjorn recommends removing the 
iomap_table[pdata->rg_bar] check, after adding the verification on the 
pcim_iomap_table, because all other drivers doesn't do that.

Thanks!

-Gustavo
> 
> Krzysztof