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

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Date:	Tue, 13 Aug 2013 11:22:56 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org,
	Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 1/9] PCI: mvebu: move clock enable before register access

On 08/13/13 09:11, Thomas Petazzoni wrote:
> On Mon, 12 Aug 2013 20:46:47 +0200, Sebastian Hesselbarth wrote:
>> +		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);
>
> You shouldn't iounmap() here in case of error, since the register
> mapping hasn't been done yet.

Dooh, it was in my testing branch, but I failed to transfer that when
separating the changes to single patches. Will update.

>> +			port->haslink = 0;
>> +			continue;
>> +		}
>> +		clk_prepare_enable(port->clk);
>
> Nitpick, an empty new line between the closing } and the
> clk_prepare_enable() line would be nice.

Ok, as Theirry mentioned to check for clk_prepare_enable's return value
that would give a new "if (..)" anyway. Although, it might be the first
driver ever checking for this return value ;)

>> +
>>   		port->base = mvebu_pcie_map_registers(pdev, child, port);
>>   		if (!port->base) {
>>   			dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
>> @@ -916,22 +926,9 @@ static int __init mvebu_pcie_probe(struct platform_device *pdev)
>>   				 port->port, port->lane);
>
> and maybe here you could unprepare+release the clock if we haven't
> managed to remap registers?

Ack.

Sebastian
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