2023-03-23 11:40:23

by Cai Huoqing

[permalink] [raw]
Subject: [PATCH 1/3] can: c_can: 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 <[email protected]>
---
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);
}
--
2.34.1


2023-03-23 11:40:43

by Cai Huoqing

[permalink] [raw]
Subject: [PATCH 2/3] can: ctucanfd: 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 <[email protected]>
---
drivers/net/can/ctucanfd/ctucanfd_pci.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/net/can/ctucanfd/ctucanfd_pci.c b/drivers/net/can/ctucanfd/ctucanfd_pci.c
index 8f2956a8ae43..9da09e7dd63a 100644
--- a/drivers/net/can/ctucanfd/ctucanfd_pci.c
+++ b/drivers/net/can/ctucanfd/ctucanfd_pci.c
@@ -206,10 +206,8 @@ static int ctucan_pci_probe(struct pci_dev *pdev,
err_pci_iounmap_bar1:
pci_iounmap(pdev, addr);
err_release_regions:
- if (msi_ok) {
+ if (msi_ok)
pci_disable_msi(pdev);
- pci_clear_master(pdev);
- }
pci_release_regions(pdev);
err_disable_device:
pci_disable_device(pdev);
@@ -257,10 +255,8 @@ static void ctucan_pci_remove(struct pci_dev *pdev)

pci_iounmap(pdev, bdata->bar1_base);

- if (bdata->use_msi) {
+ if (bdata->use_msi)
pci_disable_msi(pdev);
- pci_clear_master(pdev);
- }

pci_release_regions(pdev);
pci_disable_device(pdev);
--
2.34.1

2023-03-23 11:41:32

by Cai Huoqing

[permalink] [raw]
Subject: [PATCH 3/3] can: kvaser_pciefd: 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 <[email protected]>
---
drivers/net/can/kvaser_pciefd.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index bcad11709bc9..53e8a914c88b 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -1907,7 +1907,6 @@ static void kvaser_pciefd_remove(struct pci_dev *pdev)

free_irq(pcie->pci->irq, pcie);

- pci_clear_master(pdev);
pci_iounmap(pdev, pcie->reg_base);
pci_release_regions(pdev);
pci_disable_device(pdev);
--
2.34.1

2023-03-24 16:23:49

by Marc Kleine-Budde

[permalink] [raw]
Subject: Re: [PATCH 1/3] can: c_can: Remove redundant pci_clear_master

On 23.03.2023 19:33:15, Cai Huoqing wrote:
> Remove pci_clear_master to simplify the code,
> the bus-mastering is also cleared in do_pci_disable_device,
> like this:

Applied to can-next.

Thanks,
Marc

--
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