linux-kernel - [PATCH 3/3] can: kvaser_pciefd: Remove redundant pci_clear

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Message-Id: <20230323113318.9473-3-cai.huoqing@linux.dev>
Date:   Thu, 23 Mar 2023 19:33:17 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     cai.huoqing@...ux.dev
Cc:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Pavel Pisa <pisa@....felk.cvut.cz>,
        Ondrej Ille <ondrej.ille@...il.com>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] can: kvaser_pciefd: 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>
---
 drivers/net/can/kvaser_pciefd.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index bcad11709bc9..53e8a914c88b 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -1907,7 +1907,6 @@ static void kvaser_pciefd_remove(struct pci_dev *pdev)
 
 	free_irq(pcie->pci->irq, pcie);
 
-	pci_clear_master(pdev);
 	pci_iounmap(pdev, pcie->reg_base);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
-- 
2.34.1