netdev - Re: [PATCH v8 3/5] mfd: ioc3: Add driver for SGI IOC3 chip

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Date:   Thu, 10 Oct 2019 15:29:49 +0200
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        netdev@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v8 3/5] mfd: ioc3: Add driver for SGI IOC3 chip

On Wed, 9 Oct 2019 20:17:14 -0700
Jakub Kicinski <jakub.kicinski@...ronome.com> wrote:

> On Wed,  9 Oct 2019 12:17:10 +0200, Thomas Bogendoerfer wrote:
> [...]
> > +static int ioc3_cad_duo_setup(struct ioc3_priv_data *ipd)
> > +{
> > +	int ret;
> > +
> > +	ret = ioc3_irq_domain_setup(ipd, ipd->pdev->irq);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = ioc3_eth_setup(ipd, true);
> > +	if (ret)
> > +		return ret;
> > +
> > +	return ioc3_kbd_setup(ipd);
> > +}
> 
> None of these setup calls have a "cleanup" or un-setup call. Is this
> really okay? I know nothing about MFD, but does mfd_add_devices() not
> require a remove for example? Doesn't the IRQ handling need cleanup?

good catch, I'll add that.

> > +	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> > +	if (ret) {
> > +		dev_warn(&pdev->dev,
> > +			 "Failed to set 64-bit DMA mask, trying 32-bit\n");
> > +		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> > +		if (ret) {
> > +			dev_err(&pdev->dev, "Can't set DMA mask, aborting\n");
> > +			return ret;
> 
> So failing here we don't care about disabling the pci deivce..

fixed in the next version.

> > +
> > +	/*
> > +	 * Map all IOC3 registers.  These are shared between subdevices
> > +	 * so the main IOC3 module manages them.
> > +	 */
> > +	regs = pci_ioremap_bar(pdev, 0);
> 
> This doesn't seem unmapped on error paths, nor remove?

will fix.

Thank you for the review.

Thomas.

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