linux-kernel - Re: [PATCH 13/15] pci: mvebu: Convert to use devm_ioremap

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Date:	Tue, 11 Jun 2013 10:21:54 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	Sachin Kamat <sachin.kamat@...aro.org>
CC:	linux-kernel@...r.kernel.org, thierry.reding@...il.com,
	patches@...aro.org, linux-pci@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 13/15] pci: mvebu: Convert to use devm_ioremap_resource

On 06/10/2013 07:59 PM, Sachin Kamat wrote:
> On 10 June 2013 17:05, Tushar Behera <tushar.behera@...aro.org> wrote:
>> Commit 75096579c3ac ("lib: devres: Introduce devm_ioremap_resource()")
>> introduced devm_ioremap_resource() and deprecated the use of
>> devm_request_and_ioremap().
>>
>> Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
>> CC: linux-pci@...r.kernel.org
>> CC: Bjorn Helgaas <bhelgaas@...gle.com>
>> ---
>>  drivers/pci/host/pci-mvebu.c |    5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
>> index 13a633b..e714876 100644
>> --- a/drivers/pci/host/pci-mvebu.c
>> +++ b/drivers/pci/host/pci-mvebu.c
>> @@ -752,7 +752,7 @@ mvebu_pcie_map_registers(struct platform_device *pdev,
>>         if (ret)
>>                 return NULL;
>>
>> -       return devm_request_and_ioremap(&pdev->dev, &regs);
>> +       return devm_ioremap_resource(&pdev->dev, &regs);
>>  }
>>
>>  static int __init mvebu_pcie_probe(struct platform_device *pdev)
>> @@ -842,9 +842,10 @@ static int __init mvebu_pcie_probe(struct platform_device *pdev)
>>                         continue;
>>
>>                 port->base = mvebu_pcie_map_registers(pdev, child, port);
>> -               if (!port->base) {
>> +               if (IS_ERR(port->base)) {
>>                         dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
>>                                 port->port, port->lane);
> 
> This error message is redundant.
> 

It provides a little more information regarding the port and lane number
which might be useful in debugging.

>> +                       port->base = NULL;
> Probably this is also not needed.
> 

I was not sure about the default error value for port->base, hence I
replicated the old behaviour.

Thanks.
-- 
Tushar Behera
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