linux-kernel - Re: [PATCH v7 2/2] add new platform driver for PCI RC

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Date:	Tue, 2 Feb 2016 17:14:49 -0600
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Joao Pinto <Joao.Pinto@...opsys.com>, Vineet.Gupta1@...opsys.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-snps-arc@...ts.infradead.org, CARLOS.PALMINHA@...opsys.com,
	Alexey.Brodkin@...opsys.com, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org
Subject: Re: [PATCH v7 2/2] add new platform driver for PCI RC

On Tue, Feb 02, 2016 at 09:25:25PM +0100, Arnd Bergmann wrote:
> On Monday 01 February 2016 18:07:45 Joao Pinto wrote:
> > +static void synopsys_pcie_establish_link(struct pcie_port *pp)
> > +{
> > +	int retries = 0;
> > +
> > +	/* check if the link is up or not */
> > +	for (retries = 0; retries < 10; retries++) {
> > +		if (dw_pcie_link_up(pp)) {
> > +			dev_info(pp->dev, "Link up\n");
> > +			return;
> > +		}
> > +		mdelay(100);
> > +	}
> > +}
> 
> That mdelay() needs to be an msleep(). You should never waste
> a whole second worth of CPU time in a driver.

There are six other copies of this code, and two of them (exynos and
spear) have the same problem.

Bjorn