netdev - RE: [PATCH 4/5] wifi: rtw88: Remove redundant pci_clear

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Date:   Mon, 27 Mar 2023 00:36:59 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Cai Huoqing <cai.huoqing@...ux.dev>
CC:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "Paolo Abeni" <pabeni@...hat.com>,
        Yan-Hsuan Chuang <tony0620emma@...il.com>,
        "ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ath11k@...ts.infradead.org" <ath11k@...ts.infradead.org>,
        "ath12k@...ts.infradead.org" <ath12k@...ts.infradead.org>
Subject: RE: [PATCH 4/5] wifi: rtw88: Remove redundant pci_clear_master



> -----Original Message-----
> From: Cai Huoqing <cai.huoqing@...ux.dev>
> Sent: Thursday, March 23, 2023 7:26 PM
> To: cai.huoqing@...ux.dev
> Cc: Kalle Valo <kvalo@...nel.org>; David S. Miller <davem@...emloft.net>; Eric Dumazet
> <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Yan-Hsuan Chuang
> <tony0620emma@...il.com>; Ping-Ke Shih <pkshih@...ltek.com>; ath10k@...ts.infradead.org;
> linux-wireless@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> ath11k@...ts.infradead.org; ath12k@...ts.infradead.org
> Subject: [PATCH 4/5] wifi: rtw88: Remove redundant pci_clear_master
> 
> 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>

Reviewed-by: Ping-Ke Shih <pkshih@...ltek.com>

> ---
>  drivers/net/wireless/realtek/rtw88/pci.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
> index b4bd831c9845..60145d2f3e5a 100644
> --- a/drivers/net/wireless/realtek/rtw88/pci.c
> +++ b/drivers/net/wireless/realtek/rtw88/pci.c
> @@ -1552,7 +1552,6 @@ static int rtw_pci_claim(struct rtw_dev *rtwdev, struct pci_dev *pdev)
> 
>  static void rtw_pci_declaim(struct rtw_dev *rtwdev, struct pci_dev *pdev)
>  {
> -       pci_clear_master(pdev);
>         pci_disable_device(pdev);
>  }
> 
> --
> 2.34.1