linux-kernel - Re: [PATCH 5/5] wifi: rtw89: Remove redundant pci_clear

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Message-ID: <ZCARDyAfmaivvwej@corigine.com>
Date:   Sun, 26 Mar 2023 11:31:59 +0200
From:   Simon Horman <simon.horman@...igine.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>,
        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: Re: [PATCH 5/5] wifi: rtw89: Remove redundant pci_clear_master

On Thu, Mar 23, 2023 at 07:26:13PM +0800, 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>

Reviewed-by: Simon Horman <simon.horman@...igine.com>