linux-kernel - [PATCH 1/8] net: liquidio: Remove redundant pci_clear

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Date:   Thu, 23 Mar 2023 17:03:00 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     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>,
        Shannon Nelson <shannon.nelson@....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: [PATCH 1/8] net: liquidio: 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/ethernet/cavium/liquidio/lio_main.c    | 1 -
 drivers/net/ethernet/cavium/liquidio/lio_vf_main.c | 1 -
 2 files changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index fd7c80edb6e8..9bd1d2d7027d 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -1129,7 +1129,6 @@ static void octeon_destroy_resources(struct octeon_device *oct)
 
 		fallthrough;
 	case OCT_DEV_PCI_ENABLE_DONE:
-		pci_clear_master(oct->pci_dev);
 		/* Disable the device, releasing the PCI INT */
 		pci_disable_device(oct->pci_dev);
 
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
index ac196883f07e..e2921aec3da0 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
@@ -577,7 +577,6 @@ static void octeon_destroy_resources(struct octeon_device *oct)
 
 		fallthrough;
 	case OCT_DEV_PCI_ENABLE_DONE:
-		pci_clear_master(oct->pci_dev);
 		/* Disable the device, releasing the PCI INT */
 		pci_disable_device(oct->pci_dev);
 
-- 
2.34.1