linux-kernel - Re: [PATCH 1/9] PCI: mvebu: move clock enable before register access

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Message-ID: <20130813075830.GC9316@ulmo>
Date:	Tue, 13 Aug 2013 09:58:31 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/9] PCI: mvebu: move clock enable before register access

On Mon, Aug 12, 2013 at 08:46:47PM +0200, Sebastian Hesselbarth wrote:
[...]
> diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
[...]
> @@ -897,6 +897,16 @@ static int __init mvebu_pcie_probe(struct platform_device *pdev)
>  			continue;
>  		}
>  
> +		port->clk = of_clk_get_by_name(child, NULL);
> +		if (IS_ERR(port->clk)) {
> +			dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
> +			       port->port, port->lane);
> +			iounmap(port->base);
> +			port->haslink = 0;
> +			continue;
> +		}
> +		clk_prepare_enable(port->clk);

I see that this was already wrong previously, but since you're changing
the line anyway you should probably also check for failure of the
clk_prepare_enable() call and error out if it can't be prepare/enabled.

Thierry

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