linux-kernel - Re: [PATCH 2/7] scsi/csiostor: use pcie_capability

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Date:	Thu, 5 Sep 2013 15:37:07 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"David S. Miller" <davem@...emloft.net>,
	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Naresh Kumar Inna <naresh@...lsio.com>,
	Jesper Juhl <jj@...osbits.net>, <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 2/7] scsi/csiostor: use pcie_capability_xxx to simplify
 code

On 2013/9/4 7:43, Bjorn Helgaas wrote:
> On Tue, Sep 03, 2013 at 03:35:10PM +0800, Yijing Wang wrote:
>> Pcie_capability_xxx() interfaces were introudced to
> 
> s/introudced/introduced/

Will update it.

> 
>> simplify code to access PCIe Cap config space. And
>> because PCI core saves the PCIe Cap offset in
>> set_pcie_port_type() when device is enumerated.
>> So we can use pci_is_pcie() instead.
>>
>> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
>> Cc: Jiang Liu <jiang.liu@...wei.com>
>> Cc: "James E.J. Bottomley" <JBottomley@...allels.com>
>> Cc: Naresh Kumar Inna <naresh@...lsio.com>
>> Cc: "David S. Miller" <davem@...emloft.net>
>> Cc: Jesper Juhl <jj@...osbits.net>
>> Cc: linux-scsi@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> ---
>>  drivers/scsi/csiostor/csio_hw.c |    9 +++------
>>  1 files changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/scsi/csiostor/csio_hw.c b/drivers/scsi/csiostor/csio_hw.c
>> index 0eb35b9..be9a6ef 100644
>> --- a/drivers/scsi/csiostor/csio_hw.c
>> +++ b/drivers/scsi/csiostor/csio_hw.c
>> @@ -856,15 +856,12 @@ static void
>>  csio_set_pcie_completion_timeout(struct csio_hw *hw, u8 range)
>>  {
>>  	uint16_t val;
>> -	int pcie_cap;
>>  
>> -	if (!csio_pci_capability(hw->pdev, PCI_CAP_ID_EXP, &pcie_cap)) {
>> -		pci_read_config_word(hw->pdev,
>> -				     pcie_cap + PCI_EXP_DEVCTL2, &val);
>> +	if (pci_is_pcie(hw->pdev)) {
>> +		pcie_capability_read_word(hw->pdev, PCI_EXP_DEVCTL2, &val);
>>  		val &= 0xfff0;
>>  		val |= range ;
>> -		pci_write_config_word(hw->pdev,
>> -				      pcie_cap + PCI_EXP_DEVCTL2, val);
>> +		pcie_capability_write_word(hw->pdev, PCI_EXP_DEVCTL2, val);
> 
> Please add a #define for the Completion Timeout Value field and use
> pcie_capability_clear_and_set_word() instead of writing it out the
> long way here.

Will update it, thanks!

> 
>>  	}
>>  }
>>  
>> -- 
>> 1.7.1
>>
>>
> 
> .
> 


-- 
Thanks!
Yijing

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