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From:   Cai Huoqing <cai.huoqing@linux.dev>
To:     cai.huoqing@linux.dev
Cc:     Derek Chickles <dchickles@marvell.com>,
        Satanand Burla <sburla@marvell.com>,
        Felix Manlunas <fmanlunas@marvell.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Raju Rangoju <rajur@chelsio.com>,
        Dariusz Marcinkiewicz <reksio@newterm.pl>,
        Dimitris Michailidis <dmichail@fungible.com>,
        Yisen Zhuang <yisen.zhuang@huawei.com>,
        Salil Mehta <salil.mehta@huawei.com>,
        Saeed Mahameed <saeedm@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        Shannon Nelson <shannon.nelson@amd.com>,
        Brett Creeley <brett.creeley@amd.com>, drivers@pensando.io,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Guangbin Huang <huangguangbin2@huawei.com>,
        Jian Shen <shenjian15@huawei.com>, Hao Lan <lanhao@huawei.com>,
        Jie Wang <wangjie125@huawei.com>,
        Long Li <longli@microsoft.com>, Jiri Pirko <jiri@resnulli.us>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-rdma@vger.kernel.org, linux-hyperv@vger.kernel.org
Subject: [PATCH 3/8] net: cxgb4vf: Remove redundant pci_clear_master
Date:   Thu, 23 Mar 2023 17:03:02 +0800
Message-Id: <20230323090314.22431-3-cai.huoqing@linux.dev>
In-Reply-To: <20230323090314.22431-1-cai.huoqing@linux.dev>
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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@linux.dev>
---
 drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
index 63b2bd084130..9ba0864592e8 100644
--- a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
@@ -3258,7 +3258,6 @@ static int cxgb4vf_pci_probe(struct pci_dev *pdev,
 
 err_release_regions:
 	pci_release_regions(pdev);
-	pci_clear_master(pdev);
 
 err_disable_device:
 	pci_disable_device(pdev);
@@ -3338,7 +3337,6 @@ static void cxgb4vf_pci_remove(struct pci_dev *pdev)
 	 * Disable the device and release its PCI resources.
 	 */
 	pci_disable_device(pdev);
-	pci_clear_master(pdev);
 	pci_release_regions(pdev);
 }
 
-- 
2.34.1