From: Cai Huoqing <cai.huoqing@linux.dev>
To: cai.huoqing@linux.dev
Cc: Sanjay R Mehta <sanju.mehta@amd.com>,
Shyam Sundar S K <Shyam-sundar.S-k@amd.com>,
Jon Mason <jdmason@kudzu.us>, Dave Jiang <dave.jiang@intel.com>,
Allen Hubbe <allenbh@gmail.com>, Frank Li <Frank.Li@nxp.com>,
ntb@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/3] ntb_hw_amd: Remove redundant pci_clear_master
Date: Fri, 24 Mar 2023 09:32:18 +0800 [thread overview]
Message-ID: <20230324013224.5963-1-cai.huoqing@linux.dev> (raw)
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>
---
v1->v2: No change
v1 link:
https://lore.kernel.org/lkml/20230323115336.12986-1-cai.huoqing@linux.dev/
drivers/ntb/hw/amd/ntb_hw_amd.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index 730f2103b91d..855ff65f64a5 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -1194,7 +1194,6 @@ static int amd_ntb_init_pci(struct amd_ntb_dev *ndev,
return 0;
err_dma_mask:
- pci_clear_master(pdev);
pci_release_regions(pdev);
err_pci_regions:
pci_disable_device(pdev);
@@ -1209,7 +1208,6 @@ static void amd_ntb_deinit_pci(struct amd_ntb_dev *ndev)
pci_iounmap(pdev, ndev->self_mmio);
- pci_clear_master(pdev);
pci_release_regions(pdev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
--
2.34.1
next reply other threads:[~2023-03-24 1:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-24 1:32 Cai Huoqing [this message]
2023-03-24 1:32 ` [PATCH v2 2/3] ntb: epf: Remove redundant pci_clear_master Cai Huoqing
2023-03-24 1:32 ` [PATCH v2 3/3] ntb: intel: " Cai Huoqing
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