linux-kernel - [PATCH] accel/habanalabs: Remove redundant pci_clear

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Date:   Thu, 23 Mar 2023 16:35:49 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     cai.huoqing@...ux.dev
Cc:     Oded Gabbay <ogabbay@...nel.org>, Tomer Tayar <ttayar@...ana.ai>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] accel/habanalabs: 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/accel/habanalabs/common/device.c  | 1 -
 drivers/accel/habanalabs/common/pci/pci.c | 2 --
 2 files changed, 3 deletions(-)

diff --git a/drivers/accel/habanalabs/common/device.c b/drivers/accel/habanalabs/common/device.c
index 713005998cbc..2fb1e2ec3a83 100644
--- a/drivers/accel/habanalabs/common/device.c
+++ b/drivers/accel/habanalabs/common/device.c
@@ -1271,7 +1271,6 @@ int hl_device_resume(struct hl_device *hdev)
 	return 0;
 
 disable_device:
-	pci_clear_master(hdev->pdev);
 	pci_disable_device(hdev->pdev);
 
 	return rc;
diff --git a/drivers/accel/habanalabs/common/pci/pci.c b/drivers/accel/habanalabs/common/pci/pci.c
index d1f4c695baf2..191e0e3cf3a5 100644
--- a/drivers/accel/habanalabs/common/pci/pci.c
+++ b/drivers/accel/habanalabs/common/pci/pci.c
@@ -420,7 +420,6 @@ int hl_pci_init(struct hl_device *hdev)
 unmap_pci_bars:
 	hl_pci_bars_unmap(hdev);
 disable_device:
-	pci_clear_master(pdev);
 	pci_disable_device(pdev);
 
 	return rc;
@@ -436,6 +435,5 @@ void hl_pci_fini(struct hl_device *hdev)
 {
 	hl_pci_bars_unmap(hdev);
 
-	pci_clear_master(hdev->pdev);
 	pci_disable_device(hdev->pdev);
 }
-- 
2.34.1