From: Jean-Philippe Brucker jean-philippe@linaro.org
[ Upstream commit 47d26684185d09e083669bbbd0c465ab3493a51f ]
When setting up DMA for a PCI device, we need to initialize its iommu_fwspec with all possible alias RIDs (such as PCI bridges). To do this we use pci_for_each_dma_alias() which calls viot_pci_dev_iommu_init(). This function incorrectly initializes the fwspec of the bridge instead of the device being configured. Fix it by passing the original device as context to pci_for_each_dma_alias().
Fixes: 3cf485540e7b ("ACPI: Add driver for the VIOT table") Link: https://lore.kernel.org/all/Y8qzOKm6kvhGWG1T@myrica Reported-by: Eric Auger eric.auger@redhat.com Signed-off-by: Jean-Philippe Brucker jean-philippe@linaro.org Reviewed-by: Eric Auger eric.auger@redhat.com Tested-by: Eric Auger eric.auger@redhat.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/viot.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/viot.c b/drivers/acpi/viot.c index ed752cbbe6362..c8025921c129b 100644 --- a/drivers/acpi/viot.c +++ b/drivers/acpi/viot.c @@ -328,6 +328,7 @@ static int viot_pci_dev_iommu_init(struct pci_dev *pdev, u16 dev_id, void *data) { u32 epid; struct viot_endpoint *ep; + struct device *aliased_dev = data; u32 domain_nr = pci_domain_nr(pdev->bus);
list_for_each_entry(ep, &viot_pci_ranges, list) { @@ -338,7 +339,7 @@ static int viot_pci_dev_iommu_init(struct pci_dev *pdev, u16 dev_id, void *data) epid = ((domain_nr - ep->segment_start) << 16) + dev_id - ep->bdf_start + ep->endpoint_id;
- return viot_dev_iommu_init(&pdev->dev, ep->viommu, + return viot_dev_iommu_init(aliased_dev, ep->viommu, epid); } } @@ -372,7 +373,7 @@ int viot_iommu_configure(struct device *dev) { if (dev_is_pci(dev)) return pci_for_each_dma_alias(to_pci_dev(dev), - viot_pci_dev_iommu_init, NULL); + viot_pci_dev_iommu_init, dev); else if (dev_is_platform(dev)) return viot_mmio_dev_iommu_init(to_platform_device(dev)); return -ENODEV;