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

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Date:   Tue, 17 Nov 2020 13:58:34 -0800
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Sean V Kelley <sean.v.kelley@...el.com>, bhelgaas@...gle.com,
        Jonathan.Cameron@...wei.com, xerces.zhao@...il.com,
        rafael.j.wysocki@...el.com, ashok.raj@...el.com,
        tony.luck@...el.com, sathyanarayanan.kuppuswamy@...el.com,
        qiuxu.zhuo@...el.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 07/16] PCI/ERR: Simplify by computing pci_pcie_type()
 once

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 ?

> 
> [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