linux-kernel - Re: [PATCH 7/8] ionic: Remove redundant pci_clear

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Date:   Thu, 23 Mar 2023 09:32:26 -0700
From:   Shannon Nelson <shannon.nelson@....com>
To:     Cai Huoqing <cai.huoqing@...ux.dev>
Cc:     Derek Chickles <dchickles@...vell.com>,
        Satanand Burla <sburla@...vell.com>,
        Felix Manlunas <fmanlunas@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Raju Rangoju <rajur@...lsio.com>,
        Dariusz Marcinkiewicz <reksio@...term.pl>,
        Dimitris Michailidis <dmichail@...gible.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Brett Creeley <brett.creeley@....com>, drivers@...sando.io,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        Jian Shen <shenjian15@...wei.com>, Hao Lan <lanhao@...wei.com>,
        Jie Wang <wangjie125@...wei.com>,
        Long Li <longli@...rosoft.com>, Jiri Pirko <jiri@...nulli.us>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-hyperv@...r.kernel.org
Subject: Re: [PATCH 7/8] ionic: Remove redundant pci_clear_master

On 3/23/23 2:03 AM, Cai Huoqing wrote:
> Remove pci_clear_master to simplify the code,
> the bus-mastering is also cleared in do_pci_disable_device,
> like this:
> ./drivers/pci/pci.c:2197
> static void do_pci_disable_device(struct pci_dev *dev)
> {
>          u16 pci_command;
> 
>          pci_read_config_word(dev, PCI_COMMAND, &pci_command);
>          if (pci_command & PCI_COMMAND_MASTER) {
>                  pci_command &= ~PCI_COMMAND_MASTER;
>                  pci_write_config_word(dev, PCI_COMMAND, pci_command);
>          }
> 
>          pcibios_disable_device(dev);
> }.
> And dev->is_busmaster is set to 0 in pci_disable_device.
> 
> Signed-off-by: Cai Huoqing <cai.huoqing@...ux.dev>

Thanks!
sln

Acked-by: Shannon Nelson <shannon.nelson@....com>

> ---
>   drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
> index e508f8eb43bf..b8678da1cce5 100644
> --- a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
> +++ b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
> @@ -392,7 +392,6 @@ static void ionic_remove(struct pci_dev *pdev)
>          ionic_port_reset(ionic);
>          ionic_reset(ionic);
>          ionic_dev_teardown(ionic);
> -       pci_clear_master(pdev);
>          ionic_unmap_bars(ionic);
>          pci_release_regions(pdev);
>          pci_disable_device(pdev);
> --
> 2.34.1
>