netdev - [PATCH net-next 03/11] can: c_can: Remove redundant pci_clear

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 27 Mar 2023 09:33:46 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Cai Huoqing <cai.huoqing@...ux.dev>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 03/11] can: c_can: Remove redundant pci_clear_master

From: Cai Huoqing <cai.huoqing@...ux.dev>

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>
Link: https://lore.kernel.org/all/20230323113318.9473-1-cai.huoqing@linux.dev
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/c_can/c_can_pci.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index bf2f8c3da1c1..093bea597f4e 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -227,7 +227,6 @@ static int c_can_pci_probe(struct pci_dev *pdev,
 	pci_iounmap(pdev, addr);
 out_release_regions:
 	pci_disable_msi(pdev);
-	pci_clear_master(pdev);
 	pci_release_regions(pdev);
 out_disable_device:
 	pci_disable_device(pdev);
@@ -247,7 +246,6 @@ static void c_can_pci_remove(struct pci_dev *pdev)
 
 	pci_iounmap(pdev, addr);
 	pci_disable_msi(pdev);
-	pci_clear_master(pdev);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 }
-- 
2.39.2