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PCI: aardvark: Disable bus mastering when unbinding driver

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commit a46f2f6dd4 upstream.

Ensure that after driver unbind PCIe cards are not able to forward
memory and I/O requests in the upstream direction.

Link: https://lore.kernel.org/r/20211130172913.9727-7-kabel@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pali Rohár
2022-05-04 18:57:31 +02:00
committed by Greg Kroah-Hartman
parent 6ee10ccca8
commit 5c9fc7a028
1 changed files with 6 additions and 0 deletions
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6
drivers/pci/controller/pci-aardvark.c
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@@ -1679,6 +1679,7 @@ static int advk_pcie_remove(struct platform_device *pdev)
{
struct advk_pcie *pcie = platform_get_drvdata(pdev);
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
u32 val;
int i;
/* Remove PCI bus with all devices */
@@ -1687,6 +1688,11 @@ static int advk_pcie_remove(struct platform_device *pdev)
pci_remove_root_bus(bridge->bus);
pci_unlock_rescan_remove();
/* Disable Root Bridge I/O space, memory space and bus mastering */
val = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
val &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
advk_writel(pcie, val, PCIE_CORE_CMD_STATUS_REG);
/* Remove IRQ domains */
advk_pcie_remove_msi_irq_domain(pcie);
advk_pcie_remove_irq_domain(pcie);