linux-kernel - Re: [PATCH 1/7] scsi/bfa: use pcie_capability

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Date:	Thu, 5 Sep 2013 15:21:46 +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>,
	Anil Gurumurthy <agurumur@...cade.com>,
	Vijaya Mohan Guvva <vmohan@...cade.com>,
	<linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 1/7] scsi/bfa: use pcie_capability_xxx to simplify code

>> @@ -794,10 +793,8 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad)
>>  			break;
>>  		}
>>  
>> -		pcie_cap_reg = pci_find_capability(pdev, PCI_CAP_ID_EXP);
>> -		if (mask != 0xffff && pcie_cap_reg) {
>> -			pcie_cap_reg += 0x08;
>> -			pci_read_config_word(pdev, pcie_cap_reg, &pcie_dev_ctl);
>> +		if (mask != 0xffff && pci_is_pcie(pdev)) {
> 
> Please move the pci_is_pcie() test up to the
> "if (pcie_mas_read_reqsz ..." statement.  There's no point in doing
> the switch statement if this isn't a PCIe device.

Right, will update.

> 
>> +			pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctl);
>>  			if ((pcie_dev_ctl & 0x7000) != mask) {
>>  				printk(KERN_WARNING "BFA[%s]: "
>>  				"pcie_max_read_request_size is %d, "
>> @@ -806,7 +803,7 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad)
>>  				pcie_max_read_reqsz);
>>  
>>  				pcie_dev_ctl &= ~0x7000;
>> -				pci_write_config_word(pdev, pcie_cap_reg,
>> +				pcie_capability_write_word(pdev, PCI_EXP_DEVCTL,
>>  						pcie_dev_ctl | mask);
> 
> Please rework this to use pcie_set_readrq() instead of writing
> the capability directly.  If we write the capability directly, we
> risk writing a value that is incompatible with the MPS
> configuration done by the PCI core.

Ah, this code is Long-winded, use pcie_set_readrq()/pcie_get_readrq() can simplify
this code much.

Thanks!
Yijing.

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


-- 
Thanks!
Yijing

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