linux-kernel - Re: [PATCH v11 07/16] PCI/ERR: Simplify by computing pci_pcie

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Date:   Tue, 17 Nov 2020 22:47:02 +0000
From:   "Kelley, Sean V" <sean.v.kelley@...el.com>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
CC:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "xerces.zhao@...il.com" <xerces.zhao@...il.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Kuppuswamy, Sathyanarayanan" <sathyanarayanan.kuppuswamy@...el.com>,
        "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>,
        Linux PCI <linux-pci@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 07/16] PCI/ERR: Simplify by computing pci_pcie_type()
 once

Hi Sathya,

> On Nov 17, 2020, at 1:58 PM, Kuppuswamy, Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
> 
> Hi,
> 
> On 11/17/20 11:19 AM, Sean V Kelley wrote:
>> Instead of calling pci_pcie_type(dev) twice, call it once and save the
>> result.  No functional change intended.
> 
> Same optimization can be applied to drivers/pci/pcie/portdrv_pci.c and
> drivers/pci/pcie/aer.c.
> 
> Can you fix them together ?

Makes sense.  I can combine the changes.

Thanks,

Sean

> 
>> [bhelgaas: split to separate patch]
>> Link: https://lore.kernel.org/r/20201002184735.1229220-6-seanvk.dev@oregontracks.org
>> Signed-off-by: Sean V Kelley <sean.v.kelley@...el.com>
>> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
>> Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> ---
>>  drivers/pci/pcie/err.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
>> index 05f61da5ed9d..7a5af873d8bc 100644
>> --- a/drivers/pci/pcie/err.c
>> +++ b/drivers/pci/pcie/err.c
>> @@ -150,6 +150,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>>  		pci_channel_state_t state,
>>  		pci_ers_result_t (*reset_subordinates)(struct pci_dev *pdev))
>>  {
>> +	int type = pci_pcie_type(dev);
>>  	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
>>  	struct pci_bus *bus;
>>  @@ -157,8 +158,8 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>>  	 * Error recovery runs on all subordinates of the first downstream port.
>>  	 * If the downstream port detected the error, it is cleared at the end.
>>  	 */
>> -	if (!(pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
>> -	      pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM))
>> +	if (!(type == PCI_EXP_TYPE_ROOT_PORT ||
>> +	      type == PCI_EXP_TYPE_DOWNSTREAM))
>>  		dev = pci_upstream_bridge(dev);
>>  	bus = dev->subordinate;
>>  
> 
> -- 
> Sathyanarayanan Kuppuswamy
> Linux Kernel Developer